BOS Trials 2013 2 Unit Discussion Thread (1 Viewer)

[ForOneEon]

Yup I recall doing the latter, (except I think I stuffed up the algebra cause I was kinda tired)

Well that makes me an idiot. I think I screwed that up big time. Dang.

 

[twinklegal19]

14)b iv) y=mx passes through the origin. If you want to enclose an area you have to have 2 intersection points between the line y=mx and the curve

You can do this two ways, either find the gradient of the tangent to f(x) at x=0 then let m < gradient or solve the equations simultaneously and let the discriminant be positive for 2 solutions (i.e. 2 intersections). If you do the latter you will get a cubic, but note x=0 is an obvious solution so divide by x and get a quadratic.

lol I got the values out for m by inspection, not sure if it counts oops

 

[JT145]

not gonna post here anymore until I get worked answers

I will be able to prove nothing except my own stupidity

 

[asianese]

Very nice paper.

 

[RealiseNothing]

lol I got the values out for m by inspection, not sure if it counts oops

uhhh how

 

[twinklegal19]

uhhh how

well I knew that the gradient at the origin was 1 so clearly m has to be between 0 and 1 for there to be two intersections?

 

[RealiseNothing]

well I knew that the gradient at the origin was 1 so clearly m has to be between 0 and 1 for there to be two intersections?

14)b iv) y=mx passes through the origin. If you want to enclose an area you have to have 2 intersection points between the line y=mx and the curve

You can do this two ways, either find the gradient of the tangent to f(x) at x=0 then let m < gradient or solve the equations simultaneously and let the discriminant be positive for 2 solutions (i.e. 2 intersections). If you do the latter you will get a cubic, but note x=0 is an obvious solution so divide by x and get a quadratic.

?

 

[twinklegal19]

Yeah, I guessed that the gradient was 1 instead of subbing it into the derivative lol

 

[RealiseNothing]

Yeah, I guessed that the gradient was 1 instead of subbing it into the derivative lol

You're kidding...

 

[twinklegal19]

You're kidding...

I was running out of time lol

 

[RealiseNothing]

I was running out of time lol

"by inspection it is obvious that, indeed, "

 

[iBibah]

"by inspection it is obvious that, indeed, "

though in her defence, carrot would only use neat values. so after sketching, if it looked like it, it probably was 1.

 

[twinklegal19]

"by inspection it is obvious that, indeed, "

clearly

 

[bottleofyarn]

So while I was procrastinating English, I wrote up these solutions complete with shoddy working Hope it's legible and please tell me if I made mistakes haha.

https://drive.google.com/folderview?id=0B4D3wNobxSuvMG93NHRCNS14UTA&usp=sharing

 

[RealiseNothing]

So while I was procrastinating English, I wrote up these solutions complete with shoddy working Hope it's legible and please tell me if I made mistakes haha.

https://drive.google.com/folderview?id=0B4D3wNobxSuvMG93NHRCNS14UTA&usp=sharing

You got question 1 of the multiple choice wrong lol.

 

[bottleofyarn]

You got question 1 of the multiple choice wrong lol.

It's funny cause it's true.

 

[RealiseNothing]

It's funny cause it's true.

The rest is fine though

Out of all the questions to get wrong though haha

 

[RealiseNothing]

Though may I suggest it would be easier instead of differentiating:



To put it in the form:



Then differentiate.

 

[Nick939]

Can we get some official solutions please?

 

[Trebla]

Official solutions (along with the results) will be released very soon!