Carrotsticks' 2014 Extension 1 HSC Solutions (2 Viewers)

[wagig]

What would you expect marks to be allocated to for Q13 c) iii)?

 

[Speed6]

got about 83 raw
what does that scale to ?

That should scale to ~90 IF you look at the raw marks database, please note scaling can differ year to year

 

[EpaX]

hmm so for the circle locus question (13 c. iii.) is the restriction on the locus x=/=0 ? if yes, would we lose a mark for not putting that restriction even if we got the equation of the circle?

 

[Kurosaki]

other than that everything looks good i think.
would i lose a mark for not writing the units in 12a)ii) ?
and in part 13ciii (parametrics), i only stated that y =/= 2a, i didn't say x =/= 0. would i lose a mark for this?

Well, that implies it so I doubt it.

 

[aDimitri]

Well, that implies it so I doubt it.

nah because i didn't say y =/= 0 so it's not quite the same thing, it's like half the restriction

 

[Kurosaki]

nah because i didn't say y =/= 0 so it's not quite the same thing, it's like half the restriction

Ah, I see what you mean. I still doubt it though because if they wanted you to say that I think they would've asked something like 'describe the locus' to fk people over.

But then again, the test was pretty easy so they'll need to discriminate..

 

[mreditor16]

they won't target restrictions imo for the locus Q.

 

[Carrotsticks]

other than that everything looks good i think.
would i lose a mark for not writing the units in 12a)ii) ?
and in part 13ciii (parametrics), i only stated that y =/= 2a, i didn't say x =/= 0. would i lose a mark for this?

No, you won't lose marks for not writing the units.

For the condition, you won't lose marks because you've shown what the Q has asked for, whihc is that Q lies on a fixed circle of radius a.

What would you expect marks to be allocated to for Q13 c) iii)?

Difficult to say for this one because there are so many different methods.

hmm so for the circle locus question (13 c. iii.) is the restriction on the locus x=/=0 ? if yes, would we lose a mark for not putting that restriction even if we got the equation of the circle?

I doubt you would lose a mark for that restriction.

 

[kimsungho]

gg 100%

 

[Samir97]

Yeeeeeeeeesssssss full marks

 

[aDimitri]

No, you won't lose marks for not writing the units.

For the condition, you won't lose marks because you've shown what the Q has asked for, whihc is that Q lies on a fixed circle of radius a.



Difficult to say for this one because there are so many different methods.



I doubt you would lose a mark for that restriction.

100% then.
satisfied with HSC now

 

[Carrotsticks]

Trying to cram the other method of doing the locus problem into the gap on page 10, fingers crossed that it can fit!

 

[kimsungho]

just wondering out of curiosity, for the rainy day question would you lose the mark if you put 30c1 instead of 30c29? they're the same thing anywayso....

 

[Kurosaki]

Trying to cram the other method of doing the locus problem into the gap on page 10, fingers crossed that it can fit!

Is this 'other method' braintic's solution or subbing coordinates directly into the equation of the circle/showing SQ=a?

 

[Carrotsticks]

just wondering out of curiosity, for the rainy day question would you lose the mark if you put 30c1 instead of 30c29? they're the same thing anywayso....

No, you would not.

 

[Kurosaki]

just wondering out of curiosity, for the rainy day question would you lose the mark if you put 30c1 instead of 30c29? they're the same thing anywayso....

No.

 

[kimsungho]

No, you would not.

thanks heaps then

 

[Carrotsticks]

Is this 'other method' braintic's solution or subbing coordinates directly into the equation of the circle/showing SQ=a?

It was along the same lines as braintic's method. I added a bit more justification because students often don't understand geometric arguments for solving loci problems.

 

[Carrotsticks]

Nope can't cram it in, I'll leave it out for now until I can be bothered to add it in.

 

[mreditor16]

Carret, would this be accepted for the last part? Is there any place they can take a mark off?