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AQA A2 Mathematics MPC4 Core 4 - 9th June 2015 [Discussion & unofficial markscheme]

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Original post by Briz97

did anyone get 7/4 for 7b?

i got that, but i dont know if is right

Original post by Skindein

i got that, but i dont know if is right

7b was the implicit differentiation one, right ^^?

If so, the answer that's been agreed upon is 11/8.

Original post by meerkat96

My go at answers

thanks - these are what I got too.

Original post by datpr0

7b was the implicit differentiation one, right ^^?

If so, the answer that's been agreed upon is 11/8.

yep, i got 7/4 i am wrong

Original post by Skindein

i got that, but i dont know if is right

i got 7/4 as well, mutsve made stupid mistake

OP

Can someone have a look at the updated first post and spot any mistakes?

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Original post by Kennethm

for 2)b)ii) I got

-1.19, they ask you for the MAXIMUM value from √29cos(x+1.19) which will be √29

Therefore √29cos(x+1.19) = √29

cos(x+1.19) = 1
x + 1.19 = 0
x = -1.19

So why is it 5.09 where as it could be both...

because the range was 0<x<2pi

Original post by Skindein

i got that, but i dont know if is right

i got that

grade boundary predictions?

OP

Original post by HennersPD

Do you remember the actual diff equation they asked you to solve?

Added it to the MS in the first post!

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On a slightly related note how harsh are examiners if you forget to mark the question reference but your work/answer is clearly for that question?

I'm pretty sure I didn't make that mistake but at the same time I always have a nagging feeling maybe I did in one of my exams.

Original post by Kennethm

grade boundary predictions?

I find it really hard to predict C4 grade boundaries so not too sure! Think I got 65/75 :/

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Original post by datpr0

(let theta equal the acute angle)

Therefore, it came from cos(theta) = 14/28
=> cos(theta) = 1/2
=> theta = 60 degrees

i got -10/root56 root14 from doing a.b=mod a mod b costheta

Original post by datpr0

He's trolling, ignore him.

I did the back up paper LOL

Original post by CD223

Can someone have a look at the updated first post and spot any mistakes?

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1. the marks for 1b were 6 not 5,
2. the differential equation solution was x = 1/5[(-1/2(1+t)^-1 + 5/2)^2 - 4],
3. the constant in the penultimate question was a not k, as stated in the question.

remove (OR 5.72???) from Q2 and we should be fine. Not sure about the vectors Part C or 8 part B though.

Also 8 part A is misleading.

Original post by jamal_m96

I did the back up paper LOL

Go away. You're literally not funny at all :/

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It seems we have agreed on all answers now except 2bii) what were the answers sure it asked for Root29cos(x + 1.19) =-1???

I got 0.57 and 3.33

Mine is pretty similar, (11, 2, 0) and (23, 6, -8). I probably have made a mistake with the y coordinate.

Original post by Jed-Singh

question 2 needs sorting and for vectors I swear it was E(11,0,0) and E(23,4,-8)

(edited 8 years ago)

How many marks do you think an A will be?

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