C4 June 2012 - Post Exam Thread - Paper and Solutions in the FIRST POST

Overall I thought it was a fairly standard paper, with a few tricky parts

Q1.

the need to sub in another value (x=1) could cause problems, which would be a disaster for part b). If a) was correct b) was reasonable

Q2.

Very straight forward, but rates of change often cause problems

Q3.

a) was fairly easy but b) and c) were odd

Q4.

Very easy separation of variables

Q5.

a) straight forward implicit differentiation but b) was tricky

Q6.

a) and b) were fairly easy but c) will cause a lot of problems

Q7.

unusual not to have the table drawn, may throw some people. b) was fairly straight forward although ln questions are odd.

Q8.

Straightforward vectors

It has been 52, 58, 58, 57, 58, 60, 61 for 80ums in the previous June sessions for C4

I would guess at the following boundaries

72 = 100ums
65 = 90ums
58 = 80ums
51 = 70ums
44 = 60ums
37 = 50ums
30 = 40ums

This thread will be locked at somepoint and then unlocked following the Core 4 examination. I will upload the paper and my solutions to this post in the morning following the exam.

I will do my best to answer questions about the paper but please try to read the thread first so that I am not answering the same questions lots of times.Here are some links to previous D1 threads, they are worth a read and you will see what the common errors were...

C4 Jan 2012 - http://www.thestudentroom.co.uk/showthread.php?t=1865949

C4 June 2011 - http://www.thestudentroom.co.uk/showthread.php?t=1619107&post=39

(Scroll to post #39)

(edited 11 years ago)

12 June C4 RW.pdf912.7KB

Reply 1

Mathematix

2

Hope everyone did as well as they wanted :smile:

Reply 2

Krish14

Easy! and grade boundries defo high :P

Reply 3

bencwbrown

11

Quite straight forward in my opinion

This was posted from The Student Room's iPhone/iPad App

Reply 4

tinzoo

can anyone tell me what they got for their vector q(last q) for the lambda?

Reply 5

Mathematix

2

Original post by tinzoo

can anyone tell me what they got for their vector q(last q) for the lambda?

4

Reply 6

bencwbrown

11

Original post by tinzoo

can anyone tell me what they got for their vector q(last q) for the lambda?

I got 4

This was posted from The Student Room's iPhone/iPad App

Reply 7

tinzoo

i think i made a calculation mistake, how many marks would i get? i found pc, then said pc.ab=0 found lambda and put back in line L.

Reply 8

mororge

I thought it was very easy, all things considered.

I also got 4 as my lambda.

I thought maybe that question 2 on the cube would catch a few people out, but only a couple of people had difficulty with that paper.

I would expect that you'd need 75/75 to get 100 ums.

Was anyone at a centre that didn't get the replacement paper?

Reply 9

Mathematix

2

Assuming you didn't make any "silly mistakes" you should be glad the paper got replaced :colone:

I sure am!

Reply 10

vc94

12

My solutions attached.

Seemed like a very straightforward paper - just watch out for attention to detail.

Q2: Rates of change - a simplified version of a question in the textbook!
Q6(c): Cartesian equation - various forms accepted I imagine.

C4_June2012_Sols.pdf975.0KB

Reply 11

Mathematix

2

Original post by vc94

My solutions attached.

Seemed like a very straightforward paper - just watch out for attention to detail.

Q2: Rates of change - a simplified version of a question in the textbook!
Q6(c): Cartesian equation - various forms accepted I imagine.

Apart from a different Cartesian equation, which I agree there are many variations, I got the same as you... so seems good :wink:

Reply 12

raheem94

13

Original post by vc94

My solutions attached.

Seemed like a very straightforward paper - just watch out for attention to detail.

Q2: Rates of change - a simplified version of a question in the textbook!
Q6(c): Cartesian equation - various forms accepted I imagine.

Arsey beaten!

Reply 13

grazie

2

Original post by raheem94

Arsey beaten!

Arsey is still in bed :sleep:

Reply 14

Charlesworth

1

Original post by vc94

My solutions attached.

Seemed like a very straightforward paper - just watch out for attention to detail.

Q2: Rates of change - a simplified version of a question in the textbook!
Q6(c): Cartesian equation - various forms accepted I imagine.

Thanks for that :biggrin:

I messed the last part of the vector question up, hopefully get one or two method marks.

Reply 15

puma21

14

How many marks out of 75 do you reckon for 80 ums?

Reply 16

theandyguthrie

10

****ing question 4. I had 1/cos^2x.

But I didn't see it. I DIDN'T SEE IT!

This was posted from The Student Room's Android App on my Galaxy Nexus

Reply 17

Inactivity

Q6(c)

y = 2\left(1\pm \sqrt{1-\frac{x^2}{3}} \right)

seems legit? :colondollar:

(edited 11 years ago)

Reply 18

Gibberish

2

Grr took both core 3 and core 4... Failed the first question of both of them... Gonna be a few marks off an A* overall (N).. Wish they'd round it if I were only one or two marks off ha!