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Edexcel C2 20th May 2015 Official Thread

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Reply 2020

bl1910

Pretty Difficult, it was split as some were very easy, the middle questions were the hardest

Reply 2021

RaghuR5

Original post by AA10743

Attachment not found

Hope you can see this picture on how the solution to how to write cos(x) in terms of k.
Pretty sure i got 100% in that paper but trust me when I tell you that's one of the hardest C2 papers I've seen, and I've done them all

When you got 4 and took it to the other side surely the two 4s cancelled each other

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Reply 2022

TeeEm

please come and vote
http://www.thestudentroom.co.uk/showthread.php?t=3343941

Reply 2023

hw1997

Original post by Jabberjay_

For the factorise one I got

(2x+1)(3x-12)(x+4)

instead of

3(2x+1)(x-4)(x+4)

SAME lol

Reply 2024

Mathisfun2015

Original post by lukejoshjames

Yeah that's what I got, but is that really the answer. I was confused because that seems more like k in terms of cos x than cos k in terms of k...

cosx=(1+(1+16k)^0.5)÷8
or cosx=(1-(1+16k)^0.5)÷8

Reply 2025

Boundless_x

Original post by 12345678zzz

I remember d2C/dr2 is something like 12pi + 600pi(r^-3) :colondollar:

I got that too :smile:

Reply 2026

thehollowcrown

Original post by edwardsheeran

I got this too!! I'm pretty sure it's wrong though

omg same hahaha it's definitely wrong but I did this too

Reply 2027

MJS107

Original post by prepdream

Same. Just that I didn't take 3 put of the bracket. Feeling regret a little bit now :frown:

How do you do that sequences question??

Reply 2028

prepdream

Original post by Jabberjay_

For the factorise one I got

(2x+1)(3x-12)(x+4)

instead of

3(2x+1)(x-4)(x+4)

I wrote (6X+3) so pretty much the same :smile:

Some one just told that it would cost only 1 mark so don't worry.

Reply 2029

Da Di Doo

Original post by jf1994

Didn't anyone else just set 4cos^x + cosx = 4-k and then factorise the LHS?

Would the 4 not disappear because there would be another 4 on the LHS?

Reply 2030

Dinaa

When does Arsey deliver?

Reply 2031

lukejoshjames

Original post by Mathisfun2015

cosx=(1+(1+16k)^0.5)÷8
or cosx=(1-(1+16k)^0.5)÷8

How did you get that?

Reply 2032

Sam_the-man

Anyone made an unofficial mark scheme yet?

Reply 2033

AA10743

Original post by RaghuR5

When you got 4 and took it to the other side surely the two 4s cancelled each other

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They do cancel out....

Reply 2034

frozo123

Overall I think the paper had a couple areas where people may have been stumped on, on the other hand you guys are lucky that an annoying circle question did not come up, or they didn't make you write logs in terms of letters and numbers which confuses a lot of people
Anywhere I think people may have been stumped on?
The geometric series question part a) and b) if you didn't know what method to use
The integration question, you had to integrate using 4 limits, a pair between 9 and 4 and a pair between 4 and 0
The trig and logs questions were alright imho.
The last question part a) may have confused people if you didn't know the surface area of a cylinder but hopefully most of you did
My predictions for the grade boundaries compared to difficulty with other years: similar to summer 2013 ( the paper had problems which were very similar )
100 ums- 75
90 ums- 69
A- 62
B- 55
C- 48
D- 41

Reply 2035

edwardsheeran

Is it right if I got (2x-1)(3x+12)(x-4) for the factorising? I know the 3 isn't outside the bracket but idk if that's even the same

Reply 2036

prepdream

Original post by MJS107

How do you do that sequences question??

Hmm pretty fine I guess. I have been practising that kind of question for a long time so not really a struggle for me :smile:

How about you?

Reply 2037

callmesra

what did people get for question 9?? as the cost? That exam was terrible and C1 was so good :frown:

Reply 2038

Supermanxxxxxx

Them trig questions were so had when do you think the mark scheme will be up

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Reply 2039

you all bent

Original post by Tizzydag

A bit inconsiderate. You should be ashamed. Just because you did well doesnt mean you should laugh at others. I hope you get like 20% . somebody like you doesnt deserve 100 ums.

lol dont cry m8

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