CCEA C3 - 23rd January 2013

Hey, I thought it was fine - hopefully 100%. The horizontal axis of symmetry was y=0 :smile:

Reply 2

I also think it was quite easy. I'm certain the mark scheme will have marks for saying let u = e^3x and all that substitution for the question mentioned so I done it that way. I hate that though because you could just do the derivative and write it down straight away.

Reply 3

Original post by Ateo

I also did that, just in case. I liked the binomial question at the end - can see it throwing some of the weaker candidates (and perhaps lowering our boundaries).

Reply 4

Original post by CD315

I also did that, just in case. I liked the binomial question at the end - can see it throwing some of the weaker candidates (and perhaps lowering our boundaries).

I agree. Pure never gets scaled though, does it?

Reply 5

Original post by Ateo

I agree. Pure never gets scaled though, does it?

It does. C2 last year got scaled - I got 74 and got 100%.

My only worry with today was not writing something down and explaining myself properly..

Reply 6

Original post by CD315

It does. C2 last year got scaled - I got 74 and got 100%.

My only worry with today was not writing something down and explaining myself properly..

It should be ok, there wasn't anything that required very specific explanations. I won't be bothered doing the solutions for now. I'm going to focus on C4 and mechanics and might post a whole bunch of solutions on Friday next week if anybody wants them.

Reply 7

Original post by Ateo

I'd love to be doing C4 and getting it out of the way - damn school. Good luck with those :smile:

I'm not too worried about solutions to be honest.

Reply 8

Original post by CD315

I'd love to be doing C4 and getting it out of the way - damn school. Good luck with those :smile:

I'm not too worried about solutions to be honest.

It is really easy, I was looking forward to some more complicated questions on parametric integration (volumes of revolution etc) but I found out that there is none on C4. Luckily I will have a little bit of fun with this when doing the AEA.

Reply 9

Original post by Ateo

Yeah, C4's fine - when you've done some STEP integration the material on C4 becomes simple! Really wish I could do it now, at least I'd have an A* earlier.

Reply 10

The only question i had trouble with was the parametric equation! My mind blanked and just did not have a clue on how to do it! For the equation of the tangent i got y=2x-1 i think? And really liked the binomial question

Reply 11

Original post by nathannnb

It was

y = 2x + 1

, not minus 1.

Reply 12

Yea i got that :smile:

for the ln questions for the first one did you get x=e and the other one x=e^3 and e^-1

Reply 13

Original post by nathannnb

Yea i got that :smile:

for the ln questions for the first one did you get x=e and the other one x=e^3 and e^-1

Correct.

Reply 14

Original post by CD315

Correct.

What did you get for the binomial question?

Reply 15

Original post by nathannnb

What did you get for the binomial question?

Can't remember exactly..

\dfrac{1}{2} + \dfrac{5x}{4}

? I think, I'm not sure though. I can't remember my

x^2

term.

Reply 16

Original post by CD315

Can't remember exactly..

\dfrac{1}{2} + \dfrac{5x}{4}

? I think, I'm not sure though. I can't remember my

x^2

term.

I got 1+x/2+7x^2/4

Reply 17

Original post by nathannnb

I got 1+x/2+7x^2/4

I'll do it now, give me 2 minutes.

Reply 18

http://www.wolframalpha.com/input/?i=expand+%282%2B7x%29%2F%28%282-x%29%282%2B3x%29%29

Original post by nathannnb

I got 1+x/2+7x^2/4

Reply 19