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Edexcel A2 C4 Mathematics June 2015 - Official Thread

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Reply 2900

infinitytheory

I DID PSYA 4 THIS MORNING TOO :redface:

it went well and then there was this exam xD

Original post by dominicwild

Method marks are my best friend. I'm realizing silly mistakes I've made >.< Like

Unparseable latex formula:

\int 3^2^x \dx = 3^2^x \ln(3) \times 6

I looked at the 3 and was multiplying by 2, so my brain did a dumb. RIP all answer marks to that question.

It sucks when questions require those pre-requisites. Coming from PSYA4 I didn't have much time to effectively revise C4.

Reply 2901

Emmi12345

Original post by Fanta4TheBanter

Did anyone else just use a substitution on the last question? It made it so much easier.

Yes I did

What substitution did you use?

Reply 2902

Paraphilos

Original post by emu_neutrino

yeah i did that as i havent really done intergation of a^x that much and didnt want to risk screwing it up so I put 3^x equal to u and i got 13pi/ln3 which seems to be what a lot of other people got.

There is a general rule for the differentiation and integration of

a^x

; they involve multiplying and dividing by

\log(a)

respectively. So you're probably correct.

Reply 2903

username1162972

Original post by anorris13

How many marks would I lose for getting the wrong value of X for Q? I got the correct equation and correct integration for b, but got the x co word wrong which will also have affected my cone? I am thinking 4?

You could only lose 1 mark in second prt. So 3 in the whole quest i reckon.

Reply 2904

sat_freak

Original post by Emmi12345

I'm mortified. :colondollar:

Everyone will see my idiotic post in the tags now, oops!
The hardest part of my French exam was doing the word count at the end... due to stress. It looked like I couldn't even count to 400, hehe.

Ability to count to 400 isn't a prerequisite for sitting in C4 though.

know, exams can stress you out in funny ways, ways you never thought were even possible.

Reply 2905

PaulCJH

Original post by HMusa

3c... Is that 32ln2 - 12 then after simplification? Since you've not put brackets it seems like +12 but I'm pretty sure I got - 12...not saying you're wrong. Just want to know for peace of mind

Pretty sure it's +12 but not 100% sure

i got -12 too buddy

The paper was hard in my opinion. Looking at the answers I think I've got at least 66/75. What UMS would that be equal to approximately? Also, I used 4000 instead of 4 for the differential equation question. How many marks could I get for that? Also, I got the wrong angle for the vectors question, and thus got a different answer for the length in the next part. Will I get any marks for it?

Reply 2908

RH0909

Original post by RH0909

Also... for the vector question, I made a super silly mistakes in part one... which means I got the whole question wrong... I feel so bad right now. But I think for part 2&3, my method were correct and all the steps were written clearly. So do I get any follow through marks at all? Or I‘ll get zero in that question? plz help me!!

anyone?

Reply 2909

ch3mistry

Unofficial Mark scheme anyone?

Reply 2910

HItchslapped

VOTE NOW ON HOW YOU FOUND THIS EXAM
Click here: http://www.thestudentroom.co.uk/show....php?t=3407487
Note: C4 JUNE 2015 UK paper ONLY!

Reply 2911

leroythelost

What the hell is the a=2 and b=-5 on Q5 about, I don't remember writing that....

Reply 2912

cerlohee

Original post by anndz3007

for the ln2 question, did anyone get 32(ln2 square)-32ln2+12 ??

Yes but I simplified the logs (cant remembere if it asked for it in its simplest form tho)

Reply 2913

tumbopipa

I integrated 3^2x as 3^2x/In3 which i now realise is wrong. Do i lose all the marks after this? or if i subbed in right etc could i still get some

Reply 2914

ludmila

Original post by HMusa

3c... Is that 32ln2 - 12 then after simplification? Since you've not put brackets it seems like +12 but I'm pretty sure I got - 12...not saying you're wrong. Just want to know for peace of mind

You can't simplify (ln 2)^2 as 2ln 2 since the whole ln was squared.

Reply 2915

Ripper Phoenix

Original post by HItchslapped

VOTE NOW ON HOW YOU FOUND THIS EXAM
Click here: http://www.thestudentroom.co.uk/show....php?t=3407487
Note: C4 JUNE 2015 UK paper ONLY!

you need to be hitched somewhere and be slapped!

stop the spamming

Reply 2916

rory58824

Got k=2 instead of k=4, would I get ECF marks?

Reply 2917

anorris13

Original post by physicsmaths

You could only lose 1 mark in second prt. So 3 in the whole quest i reckon.

Thank you this has put my mind at ease, made such a stupid mistake, but I was rushing towards the end

Reply 2918

Freddy-Francis

ffs. for finding the x for Q. i got 1 :frown:

Will i get carry forward marks?

Reply 2919

hxllyb

Original post by hxllyb

on Q8 I forgot how to differentiate 3^x, so i rearrange y = 3^x to lny = xln3,so when differentiated i got dy/dx = xy/3 so dy/dx = 6, which gave me the tangent line y = 6x -3, which looked right on the diagram. I dont understand how this made me get such different answers as no logs included. Please can someone tell me if/what i have done wrong and if i would still get any method marks?