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# AQA A2 Mathematics Pure Core 4 MPC4 - 17th June 2016 Watch

1. C3 went really well for me but i think I made a lot of silly mistakes in this one (this was a standard paper as well )- I will probably miss A* by 1-15 ums .
2. (Original post by Sam1231)
If i got 60 on C3 and 64 on C4 do you think i did enough to scrape an A*?
I would say so yes, I think the A* for C3 will be around the 60 mark and the A* for C4 around the 62 Mark
3. I don't give AQA but how was core 4? What was the Vectors question based on?
4. (Original post by yasaminO_o)
I got k=2! But some people I know got k=6 :/
k was 6 right.......
5. Doea anyone remember the equations needed to work out thw half life one? As in what info they gave you
6. All the answers I can remember putting. No idea if any of them are correct so feel free to comment:

A= -5/2
B= 9/2

-1+7X-22X^2/3

theta = 99.6° , 260.4°
(Rejecting cos0 = 1 as solutions are outside the range)

-3X +2+9/(whatever the factor was)

9/2ln3-69/2

181grams
330days

P=2/15

R=1/3

S=4/15

CosX=1/5

(2,0,-1)

C = (8,-18,-31)
D = (-4,18,29)

e^4/2

sin3x-3xcos3x = ......+pi

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7. (Original post by SunDun111)
for the singel angle identity questions what did everyone get for the 4 marker did they get 2 outside the bracket?
I think I got 2/15?

(Original post by banna1998)
Yes i got those values! i crossed the 0 and 360 and wrote "not in range" for the others
Yeah same, I put 0 and 360 in brackets and wrote that they weren't in range
8. I got 1/2e^4???

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9. (Original post by maisym00)
Uuurgh so annoyed core 3 went really well for me but this didn't. Hope my core 3 ums brings me up to A* :/ For the integration question I got 9/2ln3 -69/2, but this comes up as a negative number.. Have I done it wrong?
yo, i got that too
10. (Original post by Sam1231)
If i got 60 on C3 and 64 on C4 do you think i did enough to scrape an A*?
The C3 paper was harder than all the past papers so i'd expect the grade boundaries to be lower.
I think you might just get the A*, but only by a mark or two.
11. How did you do the vectors question? I ended up with an answer and it worked in the equation (as in AC was 3x whatever it was) but I got a different answer to you guys and my method was strange so it's probably wrong
12. (Original post by -jordan-)
2tanϴ = 3x

Differentiating it implicitly

2sec^2ϴ * (dϴ/dx) = 3

(dϴ/dx) = 3/(2sec^2ϴ)
= 3/(2(1+tan^2ϴ))
= 3/(2+2tan^2ϴ)
= 6/(4+4tan^2ϴ)

And from the question tanϴ=3x/2
Therefore tan^2ϴ = 9x^2/4
Putting this into (dϴ/dx) gives

(dϴ/dx) = 6/(4+4(9x^2/4))
= 6/4+9x^2 as required
Ok, so I think I would have 2 method marks luckily
All the answers I can remember putting. No idea if any of them are correct so feel free to comment:

A= -5/2
B= 9/2

-1+7X-22X^2/3

theta = 99.6° , 260.4°
(Rejecting cos0 = 1 as solutions are outside the range)

-3X +2+9/(whatever the factor was)

9/2ln3-69/2

181grams
330days

P=2/15

R=1/3

S=4/15

CosX=1/5

(2,0,-1)

C = (8,-18,-31)
D = (-4,18,29)

e^4/2

sin3x-3xcos3x = ......+pi

Posted from TSR Mobile
Cos x = 13/35 for me
14. (Original post by C0balt)
I was so scared whilst doing first 5 questions because they were too nice and I was so convinced that the paper must have some nightmarish question lol
Glad to have been proven wrong.

Everything was very standard until question 7 imo. The vector geometry question had a strange arrangement but the difficulty was the same as every other recent vector geometry questions.

Question 7 algebra was slightly more involved than usual but nothing out of ordinary.

Question 8 would've been very difficult for non fp2 students had they not told us to rearrange the tan^-1(3x/2), but they pointed us towards the right direction so it was doable. The following differential equation was not the simplest one ever but at least it did not involve double parts like that C3.

I expect very average gb
why FP2 for the last question?
15. (Original post by maisym00)
Uuurgh so annoyed core 3 went really well for me but this didn't. Hope my core 3 ums brings me up to A* :/ For the integration question I got 9/2ln3 -69/2, but this comes up as a negative number.. Have I done it wrong?
I got the same as you there, for the integration, I double checked the solution on my calculator, it was correct, I'm sure :-)
16. (Original post by LucasFletcher)
Doea anyone remember the equations needed to work out thw half life one? As in what info they gave you
A 10g sample of radioactive vanadium decayed to 8.106g after 100 days

8.106 = 10k^100

k = 0.997902

0.5=0.997902^t

(log0.5/log0.997902) = 330 days.
17. I got 330 days

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18. Unofficial mark scheme
19. (Original post by Mowerharvey)
Cos x = 13/35 for me
13/35 for me also.
20. (Original post by mertyuiop)
I got (4, -10/3, -1/3) and (0, 10/3, -5/3)
Yeah something like that.. I hope that's what I put

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