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Where can I find Cambridge worked solutions? (1 Viewer)
- Thread starter chxx1234
- Start date
They are in the Teacher's Suites. They are available to the teachers who may at their discretion make the solutions available to the students. They are however incomplete.
You can buy them yourself but are wasting your money if your school will make them available to students for free.
Anyway here are the links if you need to buy them:
Year 11:
Year 12:
I made a list of questions for which the solutions are missing. I haven't looked at this for a while so maybe some of the following may have already been fixed by Cambridge.
---------------------------------------------------------
Year 11 Cambridge Extension 1 solutions complete except
1D Q8e, 8f, 9e, 9f, 10e, 10f
1G Q6g, 6h, 7
2C Q6j, 6k, 6l
Chapter 2 review exercise Q16, 17, 18, 19
3D Q4
3E Q16c
4C Q7a, 8e, 8f
6E Q19
Chapter 6 review exercise Q1, 9
7D Q14e, 14g
8F Q11, 12
8G Q12
9C Q1a, 1b
9D Q2, 10, 11, 21
9E Q4
9F Q1-5, 7, 10a, 10b, 10c, 11
9G Q1a, 2b, 2c, 3, 4, 7
9H Q6b, 6c, 10a, 11b, 11c, 14
9I Q2h, 16
9K Q9b
9L Q1, 2a, 2b, 2d, 5, 6, 7
Chapter 9 review exercise Q2a, 2b, 2f, 2g, 2h, 7a, 7b
11E Q1, 2, 3, 4a, 4b, 4c, 5, 11
11F Q8c
11G Q6
11H Q1, 3, 4, 6a, 6c, 12
11J Q1, 2b, 4b, 5b, 5c, 6, 7, 8d, 9a, 9c, 11, 12a, 13, 14, 15, 16
Chapter 11 Review exercise Q2a, 2c, 2d, 5, 6, 7, 8, 9a, 9b, 9c, 9d, 9e, 9f, 9g, 9h, 9i, 13, 15, 17, 18, 22a, 23, 30a, 30b
13A Q4a, 4c, 5a, 7a, 7d, 13a, 13b, 13c, 13d, 13f
13B Q1, 2, 3, 4, 5a, 10a, 10b, 10c, 10e, 10f, 10g, 12a, 12b, 13
13C Q1, 2, 4b, 6b, 6c, 8c, 10b, 10e, 13, 14
13D Q1, 2, 3, 4a, 4b, 5, 6, 7b, 8, 9, 10, 11, 12, 13, 14
Chapter 13 Review Exercise Q3, 5b, 9, 10, 12b
14E Q18c
15A Q17
Chapter 17 review exercise Q3a
-------------------------
Some are incorrect:
3F Q10b
9C Q5
9F Q6
9I Q2a, 2c, 2d, 2e, 2f, 2g, 9
11H Q6b, 7a, 7b, 7e, 7f, 7g, 7h, 8, 9a
Chapter 11 Review exercise Q31
13C Q12a
13D Q4c, 7a
---------------------
Year 12 Ext 1 Cambridge solutions are complete except for:
1A Q21
1I Q9, 10
3G Q8e
3H Q10e, 11e
4B Q18, 19 (note solution numbered 18 is actually the solution to question 20)
5A Q12
5H Q17
6I Q4b
7D Q5
9B Q14bii
9C Q13e, 13f, 17b
Chapter 9 review exercise Q11d
11B Q5e, 5f
12A Q22b
12B Q1
Chapter 12 review exercise Q20b, 20c
13A Q2c
13C Q19biv
13D Q19e
14D Q16
15F Q5, 6, 7, 8a, 8b, 8h, 9, 10, 11a, 11b, 11c, 11f, 11g, 11h, 11i, 11j, 12
16A Q12bii (note that solution number ii is actually for iii)
16B Q12giii, 12giv, 16c (note solution numbered 16c is actually for 16d), 17d, 17e, 17f
16D Q11, 19c
16G Q1e, 2, 3, 4a, 4b, 4d, 4e, 4f, 4g, 4h, 5, 6, 7, 8a, 8b, 8c, 8e, 8f, 8g, 8h, 8i, 9
17B Q7a, 7b, 7c, 7d, 7i, 7j
17C Q10a, 11
-----------------------
Some are incorrect:
1A Q17h
3D Q16b, 16d, 16e
5H Q16 - only answer given, not complete solution
7B Q15
12A Q22a
12E Q3a
13A Q1c, 3c
You can buy them yourself but are wasting your money if your school will make them available to students for free.
Anyway here are the links if you need to buy them:
Year 11:
Year 12:
I made a list of questions for which the solutions are missing. I haven't looked at this for a while so maybe some of the following may have already been fixed by Cambridge.
---------------------------------------------------------
Year 11 Cambridge Extension 1 solutions complete except
1D Q8e, 8f, 9e, 9f, 10e, 10f
1G Q6g, 6h, 7
2C Q6j, 6k, 6l
Chapter 2 review exercise Q16, 17, 18, 19
3D Q4
3E Q16c
4C Q7a, 8e, 8f
6E Q19
Chapter 6 review exercise Q1, 9
7D Q14e, 14g
8F Q11, 12
8G Q12
9C Q1a, 1b
9D Q2, 10, 11, 21
9E Q4
9F Q1-5, 7, 10a, 10b, 10c, 11
9G Q1a, 2b, 2c, 3, 4, 7
9H Q6b, 6c, 10a, 11b, 11c, 14
9I Q2h, 16
9K Q9b
9L Q1, 2a, 2b, 2d, 5, 6, 7
Chapter 9 review exercise Q2a, 2b, 2f, 2g, 2h, 7a, 7b
11E Q1, 2, 3, 4a, 4b, 4c, 5, 11
11F Q8c
11G Q6
11H Q1, 3, 4, 6a, 6c, 12
11J Q1, 2b, 4b, 5b, 5c, 6, 7, 8d, 9a, 9c, 11, 12a, 13, 14, 15, 16
Chapter 11 Review exercise Q2a, 2c, 2d, 5, 6, 7, 8, 9a, 9b, 9c, 9d, 9e, 9f, 9g, 9h, 9i, 13, 15, 17, 18, 22a, 23, 30a, 30b
13A Q4a, 4c, 5a, 7a, 7d, 13a, 13b, 13c, 13d, 13f
13B Q1, 2, 3, 4, 5a, 10a, 10b, 10c, 10e, 10f, 10g, 12a, 12b, 13
13C Q1, 2, 4b, 6b, 6c, 8c, 10b, 10e, 13, 14
13D Q1, 2, 3, 4a, 4b, 5, 6, 7b, 8, 9, 10, 11, 12, 13, 14
Chapter 13 Review Exercise Q3, 5b, 9, 10, 12b
14E Q18c
15A Q17
Chapter 17 review exercise Q3a
-------------------------
Some are incorrect:
3F Q10b
9C Q5
9F Q6
9I Q2a, 2c, 2d, 2e, 2f, 2g, 9
11H Q6b, 7a, 7b, 7e, 7f, 7g, 7h, 8, 9a
Chapter 11 Review exercise Q31
13C Q12a
13D Q4c, 7a
---------------------
Year 12 Ext 1 Cambridge solutions are complete except for:
1A Q21
1I Q9, 10
3G Q8e
3H Q10e, 11e
4B Q18, 19 (note solution numbered 18 is actually the solution to question 20)
5A Q12
5H Q17
6I Q4b
7D Q5
9B Q14bii
9C Q13e, 13f, 17b
Chapter 9 review exercise Q11d
11B Q5e, 5f
12A Q22b
12B Q1
Chapter 12 review exercise Q20b, 20c
13A Q2c
13C Q19biv
13D Q19e
14D Q16
15F Q5, 6, 7, 8a, 8b, 8h, 9, 10, 11a, 11b, 11c, 11f, 11g, 11h, 11i, 11j, 12
16A Q12bii (note that solution number ii is actually for iii)
16B Q12giii, 12giv, 16c (note solution numbered 16c is actually for 16d), 17d, 17e, 17f
16D Q11, 19c
16G Q1e, 2, 3, 4a, 4b, 4d, 4e, 4f, 4g, 4h, 5, 6, 7, 8a, 8b, 8c, 8e, 8f, 8g, 8h, 8i, 9
17B Q7a, 7b, 7c, 7d, 7i, 7j
17C Q10a, 11
-----------------------
Some are incorrect:
1A Q17h
3D Q16b, 16d, 16e
5H Q16 - only answer given, not complete solution
7B Q15
12A Q22a
12E Q3a
13A Q1c, 3c
Last edited:
Taking this a little further there is also a list for Ext. 2 for missing solutions:
Ext 2 Cambridge solutions are complete except for:
1H Q17
2F Q17, 18, 19, 20, 21
3C Q11d
3D Q10
3E Q3e
4A Q5e
6F Q7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17
6G Q7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17
6H Q1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29
Ext. 2 Teaching Suite link:
Ext 2 Cambridge solutions are complete except for:
1H Q17
2F Q17, 18, 19, 20, 21
3C Q11d
3D Q10
3E Q3e
4A Q5e
6F Q7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17
6G Q7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17
6H Q1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29
Ext. 2 Teaching Suite link:
Last edited:
Most of these Extension 2 ones have now been added except for 3E Q3e and 6G Q17. But they are now available at https://www.angelfire.com/ab7/fourunit/Cambridge-e2-3EQ3e-6GQ17.pdf and that completes the solutions for Cambridge Extension 2.Taking this a little further there is also a list for Ext. 2 for missing solutions:
Ext 2 Cambridge solutions are complete except for:
1H Q17
2F Q17, 18, 19, 20, 21
3C Q11d
3D Q10
3E Q3e
4A Q5e
6F Q7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17
6G Q7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17
6H Q1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29
Ext. 2 Teaching Suite link:
I will update the lists for Extension 1 soon.
Last edited:
This rather complicated post is to update the list of missing Cambridge Year 11 Extension 1 solutions. As complicated as it is, the end result is to shorten the list and hence make it easier to complete the solutions.
I will make a similar post later for Cambridge Yr 12 Extension 1.
It is a somewhat larger task than the one I did for Extension 2 and so completing the solutions (and for that matter even correcting some too) will take more time and will result in a larger documents.
I have also provided some commentary to the list
Note: Some of these say "cf. Answers" or "cf. ask your teacher"
"cf. Answers" could be an acceptable solution provided one could imagine the question as an exam question and a bold answer acceptable with full marks.
"cf. Answers" is not a solution if a full solution has many steps and a bold answer would not get full marks.
“cf. ask your teacher” is not a solution. Giving the problem to someone else is not a solution. You are not going be able to delegate your responsibilities in the HSC exam so don’t start now.
-------------------
Update to Yr11 Cambridge Extension 1 solutions.
Added:
4C Q7a
6E Q19: "See answers provided in textbook." acceptable in this case
Chapter 6 review exercise Q1 "Use a calculator to find each of these values. Ensure it is in degrees mode." is not a solution - but in this case the cf. answers would suffice
Chapter 6 review exercise Q9: "See page section 6E of textbook." perhaps they mean see page 254 which would suffice
8F Q11, 12: "Cf. answers, no working required." acceptable in this case
9C Q1a, 1b: "No working required, cf. answers" acceptable
9D Q2: "No working required, cf. answers" acceptable
9F Q1-4, 7, 10a, 10b, 10c: "No working required, cf. answers" - acceptable
9G Q1a, Q2b, 2c, 3, 4, 7: "No working required, cf. answers" - acceptable
9H Q6b, 6c, 10a, 11b: "NSFR" presumably means no solution further required (or cf answers) - which would be acceptable
9L Q1, 5, 6, 7: "No working required, cf. answers" - acceptable
11E Q1, 4a, 4b, 4c, 5, 11: "cf. answers" - acceptable
11F Q8c: "cf. answers" - acceptable
11G Q6a-h: "cf. answers" - acceptable
11H Q1, 6a: "cf. answers" - acceptable
11J Q4b, 5b, 5c, 6, 7, 8d, 9a, 9c, 11, 13b, 15, 16: "cf. answers" - acceptable
Chapter 11 Review exercise Q2a, 2c, 2d, 5, 6, 7, 8, 9a, 9b, 9c, 9d, 9e, 9f, 9g, 9h, 13, 17, 18, 22a, 30a, 30b: "cf. answers" - acceptable
13A Q4a, 4c, 5a, 7a, 7d: "cf. answers" - acceptable
13A Q13d, 13f: "cf. answers" - acceptable - just note that the answers in the textbook are incorrectly labelled 13a, 13c but they are actually 13d and 13f
13B Q1, 2, 4, 5a, 10f, 12a, 12b: "cf. answers" - acceptable
13B Q13: "cf. answers" - acceptable - except note that the answer for 13a and 13b have been combined into what is incorrectly labelled 13b
13C Q1, 2, 4b, 6b, 6c, 8c, 10b, 10e, 13, 14: "cf. answers" - acceptable
13D Q1c, 2a, 12a, 14a, 14b: "cf. answers" - acceptable
Chapter 13 Review Exercise Q3, 5b, 9, 10: "cf. answers" - acceptable
Chapter 17 review exercise Q3a
-------------------------
Some are incorrect:
3F Q10b
9C Q5
9F Q6
9I Q2, 9
11H Q6b, 7a, 7b, 7e, 7f, 7g, 7h, 8, 9a
13C Q12a
13D 7a
---------------
So now we finally have a shortened list of the ones still missing:
1D Q8e, 8f, 9e, 9f, 10e, 10f
1G Q6g, 6h, 7
2C Q6j, 6k, 6l
Chapter 2 review exercise Q16, 17, 18, 19
3D Q4: "Tech-only question, no worked solution" - surely a screenshot of a wolframalpha picture would suffice - something they could easily have put into the solutions
3E Q16c
4C Q8e, 8f
7D Q14e, 14g
8G Q12 (project)
9D Q10, 11
9D Q21: "Answers may vary" - is not a solution. If that was a student response in an HSC exam it would get 0. Furthermore, "for discussion" ... really? We must have silence in the HSC exam. Quiet please.
9E Q4 (Note: Their solution which they call 4a, 4b, 4c, 4d, 4e, 4f are actually 3a, 3b, 3c, 3d, 3e, 3f and there is no solution to Q4).
9F Q5, 11: "No working required, cf. answers" - not acceptable. Several steps required. Bold answer probably wouldn't get full marks in the HSC exam
9H Q14 - incomplete and NSFR unacceptable as several steps would be required
9I Q16ai-vi: "Answers may vary" is not a solution
9I Q16bi-bii: "No working required, cf. answers." - unacceptable - several steps required
9K Q9b
9L Q2a, 2b, 2d
Chapter 9 review exercise Q2a, 2b, 2f, 2g, 2h, 7a, 7b
11E Q2, 3: "cf. answers" - except there ARE no answers!
11H Q3, 4, 6c: "cf. answers" - unacceptable - more working required
11H Q7a, Q7b, 7e, 7f, 7g, 7h - cf. answers is not a solution
11H Q12: "cf. answers" - there ARE no answers
11J Q1: "Refer to teacher" - not a solution
11J Q2b: "cf. answers" - unacceptable - more working required
11J Q12a
11J Q13a, 14: "cf. answers" - unacceptable - sketch missing
Chapter 11 Review exercise Q9i: "cf. answers" might have been acceptable had the answer been correct. The answer is incorrect.
Chapter 11 Review exercise Q15
Chapter 11 Review exercise Q23: "cf. answers" - unacceptable - more working required
Chapter 11 Review exercise Q31: "Examine the graphs of 𝑦 = 𝑠𝑖𝑛𝑥 and 𝑦 = 𝑐𝑜𝑠𝑥 to establish the phase changes" and "Examine the graphs of 𝑦 = 𝑠𝑖𝑛𝑥 and 𝑦 = 𝑐𝑜𝑠𝑥 to establish the points of intersection" is not a solution
13A Q13a, 13b, 13c: "Answers may vary" is not a solution
13B Q3, 10, 10b, 10c: "Answers may vary" is not a solution
13B Q10e, 10g: "cf. answers" - except there ARE no answers!
13D Q1a, 1b: "cf. answers" - unacceptable - graphs missing
13D Q2b, 2c, 2d, 2e, 2f, 3, 4a, 4b, 5, 6, 7b, 8, 9, 10, 11, 12b, 13, 14c: "cf. answers" - except there ARE no answers!
13D Q4c - incomplete. All they did was the mean.
Chapter 13 Review Exercise Q12b: "cf. answers" - except there ARE no answers!
14E Q18c
15A Q17: "Students check the answer themselves" is not a solution
----------------------
Here is a more thorough description of the errors in Year 11:
3F Q10b. The solution refers back to Q6a, 6b, 6c. However the question doesn't. 10b has 3 different quadratics instead.
9C Q5:
5a gradient of normal is 1/6 not -1/6
5b answer is correct but needs to show more working
5c The curve, tangent and normal all have the same y-intercept which is 15, so the normal given as y=(1/8)x-15 should be y=(1/8)x+15
5d Normal is x=4 not y=4
9F Q6:
6a - wrong derivative
6b - The normal is not 1/9. The gradient of the normal is 1/9.
9G Q2a - incomplete - however cf Answers may be acceptable
9H Q11c - incomplete - "ANSWERS MAY VARY" for the rest of the question is not a solution. Also the y-coordinate for V is incorrect in the Cambridge solutions.
9I Q2: For none of the questions do the Cambridge solutions answer the second part of the question which is to state any values of x for which the tangent is horizontal.
9I Q2a: Function is (x+1)/(x-1) not x/(x+1)
9I Q2c: Function is (3-2x)/(x+5) not x/(1-3x)
9I Q2d: Function is x^2/(1-x) not (x+1)/(x-1)
9I Q2e: Function is (x^2-1)/(x^2+1) not (x+2)/(x-2)
9I Q2f: Function is x/(1-x^2) not (x-2)/(x+2)
9I Q2g: Function is (x^3-1)/(x^3+1) not (3x-2)/(2x-3)
9I Q2h: Function is (x^2-9)/(x^2-4) not (5-4x)/(5+4x)
9I Q9:
9a: they did not find the normal
9b: they did not find the cartesian equation
11H Q6b: Purported solution to 6b is actually the solution to 6a. No solution to 6b is given
11H Q8, 9a - they didn't solve for x or alpha (note the question is wrong in Q9 because the question says solve for x and the equations are in terms of alpha)
11H Q9b: One of the answers is not correct to 2 decimal places
13C Q12a: "See ‘uniform discrete possibility distribution’ in 11A" - but 11A has nothing whatsoever to do with uniform discrete possibility distributions. 11A is "The exponential function base e". I think they meant 13A. But that is still not a solution. The answer is 1/n.
13D 7a: sigma=sqrt(17.901-3.441^2) not 17.901-3.441^2
I will make a similar post later for Cambridge Yr 12 Extension 1.
It is a somewhat larger task than the one I did for Extension 2 and so completing the solutions (and for that matter even correcting some too) will take more time and will result in a larger documents.
I have also provided some commentary to the list
Note: Some of these say "cf. Answers" or "cf. ask your teacher"
"cf. Answers" could be an acceptable solution provided one could imagine the question as an exam question and a bold answer acceptable with full marks.
"cf. Answers" is not a solution if a full solution has many steps and a bold answer would not get full marks.
“cf. ask your teacher” is not a solution. Giving the problem to someone else is not a solution. You are not going be able to delegate your responsibilities in the HSC exam so don’t start now.
-------------------
Update to Yr11 Cambridge Extension 1 solutions.
Added:
4C Q7a
6E Q19: "See answers provided in textbook." acceptable in this case
Chapter 6 review exercise Q1 "Use a calculator to find each of these values. Ensure it is in degrees mode." is not a solution - but in this case the cf. answers would suffice
Chapter 6 review exercise Q9: "See page section 6E of textbook." perhaps they mean see page 254 which would suffice
8F Q11, 12: "Cf. answers, no working required." acceptable in this case
9C Q1a, 1b: "No working required, cf. answers" acceptable
9D Q2: "No working required, cf. answers" acceptable
9F Q1-4, 7, 10a, 10b, 10c: "No working required, cf. answers" - acceptable
9G Q1a, Q2b, 2c, 3, 4, 7: "No working required, cf. answers" - acceptable
9H Q6b, 6c, 10a, 11b: "NSFR" presumably means no solution further required (or cf answers) - which would be acceptable
9L Q1, 5, 6, 7: "No working required, cf. answers" - acceptable
11E Q1, 4a, 4b, 4c, 5, 11: "cf. answers" - acceptable
11F Q8c: "cf. answers" - acceptable
11G Q6a-h: "cf. answers" - acceptable
11H Q1, 6a: "cf. answers" - acceptable
11J Q4b, 5b, 5c, 6, 7, 8d, 9a, 9c, 11, 13b, 15, 16: "cf. answers" - acceptable
Chapter 11 Review exercise Q2a, 2c, 2d, 5, 6, 7, 8, 9a, 9b, 9c, 9d, 9e, 9f, 9g, 9h, 13, 17, 18, 22a, 30a, 30b: "cf. answers" - acceptable
13A Q4a, 4c, 5a, 7a, 7d: "cf. answers" - acceptable
13A Q13d, 13f: "cf. answers" - acceptable - just note that the answers in the textbook are incorrectly labelled 13a, 13c but they are actually 13d and 13f
13B Q1, 2, 4, 5a, 10f, 12a, 12b: "cf. answers" - acceptable
13B Q13: "cf. answers" - acceptable - except note that the answer for 13a and 13b have been combined into what is incorrectly labelled 13b
13C Q1, 2, 4b, 6b, 6c, 8c, 10b, 10e, 13, 14: "cf. answers" - acceptable
13D Q1c, 2a, 12a, 14a, 14b: "cf. answers" - acceptable
Chapter 13 Review Exercise Q3, 5b, 9, 10: "cf. answers" - acceptable
Chapter 17 review exercise Q3a
-------------------------
Some are incorrect:
3F Q10b
9C Q5
9F Q6
9I Q2, 9
11H Q6b, 7a, 7b, 7e, 7f, 7g, 7h, 8, 9a
13C Q12a
13D 7a
---------------
So now we finally have a shortened list of the ones still missing:
1D Q8e, 8f, 9e, 9f, 10e, 10f
1G Q6g, 6h, 7
2C Q6j, 6k, 6l
Chapter 2 review exercise Q16, 17, 18, 19
3D Q4: "Tech-only question, no worked solution" - surely a screenshot of a wolframalpha picture would suffice - something they could easily have put into the solutions
3E Q16c
4C Q8e, 8f
7D Q14e, 14g
8G Q12 (project)
9D Q10, 11
9D Q21: "Answers may vary" - is not a solution. If that was a student response in an HSC exam it would get 0. Furthermore, "for discussion" ... really? We must have silence in the HSC exam. Quiet please.
9E Q4 (Note: Their solution which they call 4a, 4b, 4c, 4d, 4e, 4f are actually 3a, 3b, 3c, 3d, 3e, 3f and there is no solution to Q4).
9F Q5, 11: "No working required, cf. answers" - not acceptable. Several steps required. Bold answer probably wouldn't get full marks in the HSC exam
9H Q14 - incomplete and NSFR unacceptable as several steps would be required
9I Q16ai-vi: "Answers may vary" is not a solution
9I Q16bi-bii: "No working required, cf. answers." - unacceptable - several steps required
9K Q9b
9L Q2a, 2b, 2d
Chapter 9 review exercise Q2a, 2b, 2f, 2g, 2h, 7a, 7b
11E Q2, 3: "cf. answers" - except there ARE no answers!
11H Q3, 4, 6c: "cf. answers" - unacceptable - more working required
11H Q7a, Q7b, 7e, 7f, 7g, 7h - cf. answers is not a solution
11H Q12: "cf. answers" - there ARE no answers
11J Q1: "Refer to teacher" - not a solution
11J Q2b: "cf. answers" - unacceptable - more working required
11J Q12a
11J Q13a, 14: "cf. answers" - unacceptable - sketch missing
Chapter 11 Review exercise Q9i: "cf. answers" might have been acceptable had the answer been correct. The answer is incorrect.
Chapter 11 Review exercise Q15
Chapter 11 Review exercise Q23: "cf. answers" - unacceptable - more working required
Chapter 11 Review exercise Q31: "Examine the graphs of 𝑦 = 𝑠𝑖𝑛𝑥 and 𝑦 = 𝑐𝑜𝑠𝑥 to establish the phase changes" and "Examine the graphs of 𝑦 = 𝑠𝑖𝑛𝑥 and 𝑦 = 𝑐𝑜𝑠𝑥 to establish the points of intersection" is not a solution
13A Q13a, 13b, 13c: "Answers may vary" is not a solution
13B Q3, 10, 10b, 10c: "Answers may vary" is not a solution
13B Q10e, 10g: "cf. answers" - except there ARE no answers!
13D Q1a, 1b: "cf. answers" - unacceptable - graphs missing
13D Q2b, 2c, 2d, 2e, 2f, 3, 4a, 4b, 5, 6, 7b, 8, 9, 10, 11, 12b, 13, 14c: "cf. answers" - except there ARE no answers!
13D Q4c - incomplete. All they did was the mean.
Chapter 13 Review Exercise Q12b: "cf. answers" - except there ARE no answers!
14E Q18c
15A Q17: "Students check the answer themselves" is not a solution
----------------------
Here is a more thorough description of the errors in Year 11:
3F Q10b. The solution refers back to Q6a, 6b, 6c. However the question doesn't. 10b has 3 different quadratics instead.
9C Q5:
5a gradient of normal is 1/6 not -1/6
5b answer is correct but needs to show more working
5c The curve, tangent and normal all have the same y-intercept which is 15, so the normal given as y=(1/8)x-15 should be y=(1/8)x+15
5d Normal is x=4 not y=4
9F Q6:
6a - wrong derivative
6b - The normal is not 1/9. The gradient of the normal is 1/9.
9G Q2a - incomplete - however cf Answers may be acceptable
9H Q11c - incomplete - "ANSWERS MAY VARY" for the rest of the question is not a solution. Also the y-coordinate for V is incorrect in the Cambridge solutions.
9I Q2: For none of the questions do the Cambridge solutions answer the second part of the question which is to state any values of x for which the tangent is horizontal.
9I Q2a: Function is (x+1)/(x-1) not x/(x+1)
9I Q2c: Function is (3-2x)/(x+5) not x/(1-3x)
9I Q2d: Function is x^2/(1-x) not (x+1)/(x-1)
9I Q2e: Function is (x^2-1)/(x^2+1) not (x+2)/(x-2)
9I Q2f: Function is x/(1-x^2) not (x-2)/(x+2)
9I Q2g: Function is (x^3-1)/(x^3+1) not (3x-2)/(2x-3)
9I Q2h: Function is (x^2-9)/(x^2-4) not (5-4x)/(5+4x)
9I Q9:
9a: they did not find the normal
9b: they did not find the cartesian equation
11H Q6b: Purported solution to 6b is actually the solution to 6a. No solution to 6b is given
11H Q8, 9a - they didn't solve for x or alpha (note the question is wrong in Q9 because the question says solve for x and the equations are in terms of alpha)
11H Q9b: One of the answers is not correct to 2 decimal places
13C Q12a: "See ‘uniform discrete possibility distribution’ in 11A" - but 11A has nothing whatsoever to do with uniform discrete possibility distributions. 11A is "The exponential function base e". I think they meant 13A. But that is still not a solution. The answer is 1/n.
13D 7a: sigma=sqrt(17.901-3.441^2) not 17.901-3.441^2
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Update to Yr12 Cambridge Extension 1 solutions.
Added
1I Q9a, 9b, 9c, 10a, 10b: "Answers are contained in the question." - acceptable for these parts but not 9d or 10c
3G Q8e
3H Q10e, 11e
4B Q18, 19
9B Q14bii: solution is there but is incorrectly labelled 14bi
9C Q13e, 13f
Chapter 9 review exercise Q11d
11B Q5e, 5f
12A Q22a
12A Q22b
15F Q8a
-----------------------
Some are incorrect:
1A Q17h
3D Q16b, 16d, 16e
5H Q16 - only answer given, not complete solution
7B Q14b
7B Q15
12E Q3a
13A Q1c, 3c
16D Q11
----------------------
still missing:
1A Q21: "Answers will vary" is not a solution
1I 9d, 10c: "Answers are contained in the question." - OK for parts 9a, 9b, 9c, 10a, 10b nut not for 9d, 10c
5A Q12: "This question uses technology to investigate some of the definite integrals from other questions in this exercise." - does not constitute a solution.
5H Q17: "answers will vary" - is not a solution
6I Q4b
7D Q5: "Technology" is not a solution
9C Q17b
12B Q1: "Answers will very" is not a solution
Chapter 12 review exercise Q20b, 20c, 21a
13A Q2c
13C Q19biv
13D Q19e
14D Q16: "Refer to the answers for questions 3 – 11" - inappropriate solution as the question asked for a spreadsheet
15F Q5, 6, 7, 9, 12: "Answers will very" is not a solution
15F Q8b :"Refer to the Excel spreadsheet provided in the digital textbook." is OK for 8a but not 8b
15F Q8h, 10, 11a, 11b, 11c, 11f, 11g, 11h, 11i, 11j
16A Q12bii (note that solution number ii is actually for iii)
16B Q12giii, 12giv, 16c (note solution numbered 16c is actually for 16d), 17d, 17e, 17f
16D 19c
16G Q1e, 2, 3, 4a, 4b, 4d, 4e, 4f, 4g, 4h, 5, 6, 7, 8a, 8b, 8c, 8e, 8f, 8g, 8h, 8i, 9
17B Q7a, 7b, 7c, 7d, 7i, 7j
17C Q10a: "Spreadsheet" - is not a solution
17C Q11: "Spreadsheet investigation" - is not a solution
----------------------------
Here is a more thorough description of the errors in Year 12
1A Q17h: 2 curves can be drawn
3D Q16b: Firstly, it is not an enrichment exercise, but a development exercise
3D Q16d: no example given
3D Q16e: no proof given
5H Q16: - only answer given, not complete solution
7B Q14b: The last graph is for y′′′′ not y′′′.
7B Q15: There are no graphs on page 321 of the textbook
12E Q3a: Question says show that. No working is shown
13A Q1c: This was probably a mistake in the question which is first-order. The equation in the solutions is a different equation
13A Q3c: This follows from Q1c and the answer for the equation in the textbook is one arbitrary constant.
16D Q11: "The answers are the same when questions are solved using technology." - No they aren't. In particular 16D Q4ciii, 4civ and 7cii are the same as Cambridge Advanced Year 12 10D Q4ciii, 4civ and 7cii which give different answers using technology.
Added
1I Q9a, 9b, 9c, 10a, 10b: "Answers are contained in the question." - acceptable for these parts but not 9d or 10c
3G Q8e
3H Q10e, 11e
4B Q18, 19
9B Q14bii: solution is there but is incorrectly labelled 14bi
9C Q13e, 13f
Chapter 9 review exercise Q11d
11B Q5e, 5f
12A Q22a
12A Q22b
15F Q8a
-----------------------
Some are incorrect:
1A Q17h
3D Q16b, 16d, 16e
5H Q16 - only answer given, not complete solution
7B Q14b
7B Q15
12E Q3a
13A Q1c, 3c
16D Q11
----------------------
still missing:
1A Q21: "Answers will vary" is not a solution
1I 9d, 10c: "Answers are contained in the question." - OK for parts 9a, 9b, 9c, 10a, 10b nut not for 9d, 10c
5A Q12: "This question uses technology to investigate some of the definite integrals from other questions in this exercise." - does not constitute a solution.
5H Q17: "answers will vary" - is not a solution
6I Q4b
7D Q5: "Technology" is not a solution
9C Q17b
12B Q1: "Answers will very" is not a solution
Chapter 12 review exercise Q20b, 20c, 21a
13A Q2c
13C Q19biv
13D Q19e
14D Q16: "Refer to the answers for questions 3 – 11" - inappropriate solution as the question asked for a spreadsheet
15F Q5, 6, 7, 9, 12: "Answers will very" is not a solution
15F Q8b :"Refer to the Excel spreadsheet provided in the digital textbook." is OK for 8a but not 8b
15F Q8h, 10, 11a, 11b, 11c, 11f, 11g, 11h, 11i, 11j
16A Q12bii (note that solution number ii is actually for iii)
16B Q12giii, 12giv, 16c (note solution numbered 16c is actually for 16d), 17d, 17e, 17f
16D 19c
16G Q1e, 2, 3, 4a, 4b, 4d, 4e, 4f, 4g, 4h, 5, 6, 7, 8a, 8b, 8c, 8e, 8f, 8g, 8h, 8i, 9
17B Q7a, 7b, 7c, 7d, 7i, 7j
17C Q10a: "Spreadsheet" - is not a solution
17C Q11: "Spreadsheet investigation" - is not a solution
----------------------------
Here is a more thorough description of the errors in Year 12
1A Q17h: 2 curves can be drawn
3D Q16b: Firstly, it is not an enrichment exercise, but a development exercise
3D Q16d: no example given
3D Q16e: no proof given
5H Q16: - only answer given, not complete solution
7B Q14b: The last graph is for y′′′′ not y′′′.
7B Q15: There are no graphs on page 321 of the textbook
12E Q3a: Question says show that. No working is shown
13A Q1c: This was probably a mistake in the question which is first-order. The equation in the solutions is a different equation
13A Q3c: This follows from Q1c and the answer for the equation in the textbook is one arbitrary constant.
16D Q11: "The answers are the same when questions are solved using technology." - No they aren't. In particular 16D Q4ciii, 4civ and 7cii are the same as Cambridge Advanced Year 12 10D Q4ciii, 4civ and 7cii which give different answers using technology.
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Here are the corrections to incorrect Cambridge solutions to the Extension 1 Year 11 textbook:
This now leaves the following somewhat smaller list:
Missing Year 11:
1D Q8e, 8f, 9e, 9f, 10e, 10f
1G Q6g, 6h, 7
2C Q6j, 6k, 6l
Chapter 2 review exercise Q16, 17, 18, 19
3D Q4
3E Q16c
4C Q8e, 8f
7D Q14e, 14g
8G Q12
9D Q10, 11, 21
9E Q4
9F Q5, 11
9H Q14
9I Q16ai-vi, 16bi-bii
9K Q9b
9L Q2a, 2b, 2d
Chapter 9 review exercise Q2a, 2b, 2f, 2g, 2h, 7a, 7b
11E Q2, 3
11H Q3, 4, 6c, 7a, 7b, 7e, 7f, 7g, 7h, 12
11J Q1, 2b, 12a, 13a, 14
Chapter 11 Review exercise Q9i, 15, 23, 31
13A Q13a, 13b, 13c
13B Q3, 10, 10b, 10c, Q10e, 10g
13D Q1a, 1b, 2b, 2c, 2d, 2e, 2f, 3, 4a, 4b, 4c, 5, 6, 7b, 8, 9, 10, 11, 12b, 13, 14c
Chapter 13 Review Exercise Q12b
14E Q18c
15A Q17
---------------------
Incorrect Year 12:
1A Q17h
3D Q16b, 16d, 16e
5H Q16
7B Q15
12E Q3a
13A Q1c, 3c
16D Q11
------------------
Missing Year 12:
1A Q21
1I 9d, 10c
5A Q12:
5H Q17
6I Q4b
7D Q5
9C Q17b
12B Q1
Chapter 12 review exercise Q20b, 20c, 21a
13A Q2c
13C Q19biv
13D Q19e
14D Q16
15F Q5, 6, 7,8b, 8h, 9, 10, 11a, 11b, 11c, 11f, 11g, 11h, 11i, 11j, 12
16A Q12bii
16B Q12giii, 12giv, 16c, 17d, 17e, 17f
16D 19c
16G Q1e, 2, 3, 4a, 4b, 4d, 4e, 4f, 4g, 4h, 5, 6, 7, 8a, 8b, 8c, 8e, 8f, 8g, 8h, 8i, 9
17B Q7a, 7b, 7c, 7d, 7i, 7j
17C Q10a, 11
This now leaves the following somewhat smaller list:
Missing Year 11:
1D Q8e, 8f, 9e, 9f, 10e, 10f
1G Q6g, 6h, 7
2C Q6j, 6k, 6l
Chapter 2 review exercise Q16, 17, 18, 19
3D Q4
3E Q16c
4C Q8e, 8f
7D Q14e, 14g
8G Q12
9D Q10, 11, 21
9E Q4
9F Q5, 11
9H Q14
9I Q16ai-vi, 16bi-bii
9K Q9b
9L Q2a, 2b, 2d
Chapter 9 review exercise Q2a, 2b, 2f, 2g, 2h, 7a, 7b
11E Q2, 3
11H Q3, 4, 6c, 7a, 7b, 7e, 7f, 7g, 7h, 12
11J Q1, 2b, 12a, 13a, 14
Chapter 11 Review exercise Q9i, 15, 23, 31
13A Q13a, 13b, 13c
13B Q3, 10, 10b, 10c, Q10e, 10g
13D Q1a, 1b, 2b, 2c, 2d, 2e, 2f, 3, 4a, 4b, 4c, 5, 6, 7b, 8, 9, 10, 11, 12b, 13, 14c
Chapter 13 Review Exercise Q12b
14E Q18c
15A Q17
---------------------
Incorrect Year 12:
1A Q17h
3D Q16b, 16d, 16e
5H Q16
7B Q15
12E Q3a
13A Q1c, 3c
16D Q11
------------------
Missing Year 12:
1A Q21
1I 9d, 10c
5A Q12:
5H Q17
6I Q4b
7D Q5
9C Q17b
12B Q1
Chapter 12 review exercise Q20b, 20c, 21a
13A Q2c
13C Q19biv
13D Q19e
14D Q16
15F Q5, 6, 7,8b, 8h, 9, 10, 11a, 11b, 11c, 11f, 11g, 11h, 11i, 11j, 12
16A Q12bii
16B Q12giii, 12giv, 16c, 17d, 17e, 17f
16D 19c
16G Q1e, 2, 3, 4a, 4b, 4d, 4e, 4f, 4g, 4h, 5, 6, 7, 8a, 8b, 8c, 8e, 8f, 8g, 8h, 8i, 9
17B Q7a, 7b, 7c, 7d, 7i, 7j
17C Q10a, 11
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I think the most up-to-date Cambridge Extension 1 solutions are best sourced from the links I previously posted:
and
This is for more practical reasons rather than legal.
Other versions elsewhere on the net are most likely out-of-date.
As I said previously one need not buy them, but the teachers can redownload them if need be to get the more up-to-date versions from those links and Cambridge allow teachers to provide them to students free-of-charge if they deem it appropriate to do so.
This of course does not preclude you from posting up your own solutions. I would especially encourage this for the ones that are missing or incorrect. As you can see in my previous post the list is still quite large and I would appreciate any help in reducing it down further.
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The corrections to incorrect Cambridge solutions to the Extension 1 Year 12 textbook are now at http://www.angelfire.com/ab7/fourunit/Cambridge-y12-e1-sol-cor.pdf
and together with the Year 11 corrections at http://www.angelfire.com/ab7/fourunit/Cambridge-y11-e1-sol-cor.pdf this further reduces the size of the list. However it is more manageable if they are now split into 2 styles of questions: non-investigative and investigative.
Missing solutions:
Year 11 non-investigative style
1D Q8e, 8f, 9b, 9f, 10e, 10f
1G Q6g, 6h, 7
2C Q6j, 6k, 6l
Chapter 2 review exercise Q16, 17, 18, 19
3D Q4
3E Q16c
4C Q8e, 8f
7D Q14e, 14g
9D Q10, 11
9E Q4
9F Q5, 11
9H Q14
9I Q16ai-vi, 16bi-bii
9K Q9b
9L Q2a, 2b, 2d
Chapter 9 review exercise Q2a, 2b, 2f, 2g, 2h, 7a, 7b
11E Q2, 3
11H Q3, 4, 6c, 7a, 7b, 7e, 7f, 7g, 7h
Chapter 11 Review exercise Q9i, 15, 23, 31
13D Q1a, 1b
14E Q18c
15A Q17
Year 11 investigative style
8G Q12
9D Q21
11H Q12
11J Q1, 2b, 12a, 13a, 14
13A Q13a, 13b, 13c
13B Q3, 10, 10b, 10c, 10e, 10g
13D Q2b, 2c, 2d, 2e, 2f, 3, 4a, 4b, 5, 6, 7b, 8, 9, 10, 11, 12b, 13, 14c
13D Q4c
Chapter 13 Review Exercise Q12b
Year 12 non-investigative style
1I 9d, 10c
6I Q4b
9C Q17b
12B Q1
Chapter 12 review exercise Q20b, 20c, 21a
13A Q2c
13C Q19biv
13D Q19e
16A Q12bii
16B Q12giii, 12giv, 16c
16G Q1e
Year 12 investigative style
1A Q21
5A Q12
5H Q17
7D Q5
14D Q16
15F Q5, 6, 7, 8b, 8h, 9, 10, 11a, 11b, 11c, 11f, 11g, 11h, 11i, 11j, 12
16B Q17d, 17e, 17f
16D 19c
16G Q2, 3, 4a, 4b, 4d, 4e, 4f, 4g, 4h, 5, 6, 7, 8a, 8b, 8c, 8e, 8f, 8g, 8h, 8i, 9
17B Q7a, 7b, 7c, 7d, 7i, 7j
17C Q10a, 11
and together with the Year 11 corrections at http://www.angelfire.com/ab7/fourunit/Cambridge-y11-e1-sol-cor.pdf this further reduces the size of the list. However it is more manageable if they are now split into 2 styles of questions: non-investigative and investigative.
Missing solutions:
Year 11 non-investigative style
1D Q8e, 8f, 9b, 9f, 10e, 10f
1G Q6g, 6h, 7
2C Q6j, 6k, 6l
Chapter 2 review exercise Q16, 17, 18, 19
3D Q4
3E Q16c
4C Q8e, 8f
7D Q14e, 14g
9D Q10, 11
9E Q4
9F Q5, 11
9H Q14
9I Q16ai-vi, 16bi-bii
9K Q9b
9L Q2a, 2b, 2d
Chapter 9 review exercise Q2a, 2b, 2f, 2g, 2h, 7a, 7b
11E Q2, 3
11H Q3, 4, 6c, 7a, 7b, 7e, 7f, 7g, 7h
Chapter 11 Review exercise Q9i, 15, 23, 31
13D Q1a, 1b
14E Q18c
15A Q17
Year 11 investigative style
8G Q12
9D Q21
11H Q12
11J Q1, 2b, 12a, 13a, 14
13A Q13a, 13b, 13c
13B Q3, 10, 10b, 10c, 10e, 10g
13D Q2b, 2c, 2d, 2e, 2f, 3, 4a, 4b, 5, 6, 7b, 8, 9, 10, 11, 12b, 13, 14c
13D Q4c
Chapter 13 Review Exercise Q12b
Year 12 non-investigative style
1I 9d, 10c
6I Q4b
9C Q17b
12B Q1
Chapter 12 review exercise Q20b, 20c, 21a
13A Q2c
13C Q19biv
13D Q19e
16A Q12bii
16B Q12giii, 12giv, 16c
16G Q1e
Year 12 investigative style
1A Q21
5A Q12
5H Q17
7D Q5
14D Q16
15F Q5, 6, 7, 8b, 8h, 9, 10, 11a, 11b, 11c, 11f, 11g, 11h, 11i, 11j, 12
16B Q17d, 17e, 17f
16D 19c
16G Q2, 3, 4a, 4b, 4d, 4e, 4f, 4g, 4h, 5, 6, 7, 8a, 8b, 8c, 8e, 8f, 8g, 8h, 8i, 9
17B Q7a, 7b, 7c, 7d, 7i, 7j
17C Q10a, 11
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Non-investigative Year 11 additions are at https://www.angelfire.com/ab7/fourunit/Cambridge-y11-e1-sol-nia.pdf
Together with http://www.angelfire.com/ab7/fourunit/Cambridge-y11-e1-sol-cor.pdf and http://www.angelfire.com/ab7/fourunit/Cambridge-y12-e1-sol-cor.pdf this now reduced the list of the missing ones to
Year 11 investigative style:
8G Q12
9D Q21
11H Q12
11J Q1, 2b, 12a, 13a, 14
13A Q13a, 13b, 13c
13B Q3, 10, 10b, 10c, 10e, 10g
13D Q2b, 2c, 2d, 2e, 2f, 3, 4a, 4b, 5, 6, 7b, 8, 9, 10, 11, 12b, 13, 14c
13D Q4c
Chapter 13 Review Exercise Q12b
Year 12 non-investigative style:
1I Q9d, 10c
6I Q4b
9C Q17b
12B Q1
Chapter 12 review exercise Q20b, 20c, 21a
13A Q2c
13C Q19biv
13D Q19e
16A Q12bii
16B Q12giii, 12giv, 16c
16G Q1e
Year 12 investigative style:
1A Q21
5A Q12
5H Q17
7D Q5
14D Q16
15F Q5, 6, 7, 8b, 8h, 9, 10, 11a, 11b, 11c, 11f, 11g, 11h, 11i, 11j, 12
16B Q17d, 17e, 17f
16D 19c
16G Q2, 3, 4a, 4b, 4d, 4e, 4f, 4g, 4h, 5, 6, 7, 8a, 8b, 8c, 8e, 8f, 8g, 8h, 8i, 9
17B Q7a, 7b, 7c, 7d, 7i, 7j
17C Q10a, 11
Together with http://www.angelfire.com/ab7/fourunit/Cambridge-y11-e1-sol-cor.pdf and http://www.angelfire.com/ab7/fourunit/Cambridge-y12-e1-sol-cor.pdf this now reduced the list of the missing ones to
Year 11 investigative style:
8G Q12
9D Q21
11H Q12
11J Q1, 2b, 12a, 13a, 14
13A Q13a, 13b, 13c
13B Q3, 10, 10b, 10c, 10e, 10g
13D Q2b, 2c, 2d, 2e, 2f, 3, 4a, 4b, 5, 6, 7b, 8, 9, 10, 11, 12b, 13, 14c
13D Q4c
Chapter 13 Review Exercise Q12b
Year 12 non-investigative style:
1I Q9d, 10c
6I Q4b
9C Q17b
12B Q1
Chapter 12 review exercise Q20b, 20c, 21a
13A Q2c
13C Q19biv
13D Q19e
16A Q12bii
16B Q12giii, 12giv, 16c
16G Q1e
Year 12 investigative style:
1A Q21
5A Q12
5H Q17
7D Q5
14D Q16
15F Q5, 6, 7, 8b, 8h, 9, 10, 11a, 11b, 11c, 11f, 11g, 11h, 11i, 11j, 12
16B Q17d, 17e, 17f
16D 19c
16G Q2, 3, 4a, 4b, 4d, 4e, 4f, 4g, 4h, 5, 6, 7, 8a, 8b, 8c, 8e, 8f, 8g, 8h, 8i, 9
17B Q7a, 7b, 7c, 7d, 7i, 7j
17C Q10a, 11
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