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

1. How many marks would I get for 8A if i just left my answer in re-arranged form with X, but forgot to calculate the C (because didn't read question properly) ?
2. Going of this mark scheme, I believe I only made 1 mistake (the angle of the vectors question). I obviously miscopied a number somewhere. So, I believe I will have got 72/73, which should still be 100 UMS.
3. (Original post by student0042)
Going of this mark scheme, I believe I only made 1 mistake (the angle of the vectors question). I obviously miscopied a number somewhere. So, I believe I will have got 72/73, which should still be 100 UMS.
4. (Original post by Haiych)
Does anyone think average of 53 on both papers is enough for 140 ums?
yes it will be, I think
5. (Original post by bthmandem)
Not really. I just spend my time revising mathematics than posting useless content, which doesn't aid the discussion.
6. (Original post by IAmYourdog)
How many marks would I get for 8A if i just left my answer in re-arranged form with X, but forgot to calculate the C (because didn't read question properly) ?
I did the same thing?! It was very sneaky not stating that x=0 and t=0 ..
7. (Original post by CD223)
Do people think 73/75 on Core 3 and 64 or 65/75 on Core 4 will be enough for 180 on the two?

Posted from TSR Mobile
definitely
8. (Original post by CD223)
*** OFFICIAL AQA CORE 4 MPC4 JUNE 2015 EXAM DISCUSSION THREAD ***
UNOFFICIAL MARK SCHEME
1.A) Express in the form

(3 marks)

B) Find in the form .

(6 marks)

2.
A) Express in the form .

(3 Marks)

B) Find value of in interval where is at a maximum.

(i) (2 Marks)

(ii) Solve equation

(3 Marks)

3.
A) . Given when is divided by the remainder is , find .

(2 Marks)

B) Given is a solution of , express as 3 linear factors.

(3 marks)

C) is given by where . Simplify ,showing it is a decreasing function.

,

EITHER

. is always negative, therefore it is a decreasing function.

OR

Could plot graph of showing when (4 Marks)

4.
A) Find the binomial expansion of :

(2 Marks)

B)
(i) Find the binomial expansion of :

(3 Marks)

(ii) Find an estimate for .

(2 Marks)

5. .

A) Find the gradient at .

(3 Marks)

B) Find the equation of the normal at in the form :

(2 Marks)

C) Normal cuts curve at . Set up a quadratic in terms of to find where the normal cuts the curve again. Then find the co-ordinate of .

(5 Marks)

6.
Line passes through and has the equation .

A) Find the acute angle between line and .

(4 Marks)

B) (4 Marks)

C) and (4 Marks)

7. .

A) Find given point lies on the curve.

(1 Mark)

B) Find the gradient at the point :

(6 Marks)

8. .

A) Given when find in terms of .

(7 marks)

B) Another pond models a circle of radius . The rate of change of radius is inversely proportional to pond surface area. Write a differential equationto model this situation.

(i) (3 Marks)

(ii) The rate of change of radius is when the radius is metre. Find the radius when the rate is .

(2 Marks)
______________________________

Date: 9th June 2015
Time: 09:00am
Duration: 1h 30m
______________________________

______________________________

RESOURCES:
Question 8bi - there should be no π in the answer. The question asked for a differential in terms of r, t and a constant of proportionality (e.g. k). While dr/dt = k/πr^2 is technically a correct answer, it is not the simplest form - 1/π is also a constant, and can therefore be included in the constant of proportionality. So the answer should be dr/dt = k/r^2.
9. (Original post by fotevaf)
definitely
I'm so worried. I think I lost 10+ marks on that paper due to stupid mistakes

Posted from TSR Mobile
10. (Original post by TimGB)
Question 8bi - there should be no π in the answer. The question asked for a differential in terms of r, t and a constant of proportionality (e.g. k). While dr/dt = k/πr^2 is technically a correct answer, it is not the simplest form - 1/π is also a constant, and can therefore be included in the constant of proportionality. So the answer should be dr/dt = k/r^2.
How many do you think you would get if you left the pi in?
11. (Original post by CD223)
I'm so worried. I think I lost 10+ marks on that paper due to stupid mistakes

Posted from TSR Mobile

well if you are correct in your raw marks for C3
that means you've gotten 100% for that

so, as long as you get an A (80%)
you will get an a*

I reckon an A would be lower than losing 10 marks as it's C4 so.. usually grade boundaries are lower
12. (Original post by student0042)
How many do you think you would get if you left the pi in?
I reckon they will only dock 1 mark at most for that. They'll probably just ignore it though, as k/π is still of constant value.
13. Hi, I have created worked solutions of the full paper, I hope they are useful to anyone unsure. The only question I have a different answer to is the second set of coordinates for E in Question 6 part (c) I have (-1,-4,8) rather than (23, 4, 8) as on the Unofficial Mark Scheme.

Thanks.

https://dl.dropboxusercontent.com/u/...204%202015.pdf
14. (Original post by TimGB)
I reckon they will only dock 1 mark at most for that. They'll probably just ignore it though, as k/π is still of constant value.
leo ukip got more vote than the libgays
15. Got 65 on Core 3 and 62 on Core 4. Entered these on the AQA UMS converter and for every single year of June Exams (except '10), this has given me an A*!! Thought I'd missed it, but this leaves me feeling better now.

Also CD223, dude, you've OBVIOUSLY gotten an A*. Look at your results compared to mine, they are way better, and I still could get an A*.

Anyone think this years boundaries will be particularly higher, and I won't get my A*?
16. how many marks for 8A if you forgot to calculate C but did rest right
17. Think I got about 68 in this paper. Shame I got like 58 in C3 😞. Not getting that A* now
18. what overall grade would it be if I get 57/60 for c3, 48/60 for c4 (made loads of silly mistakes), and 61/75 for s1, considering that I got 240/300 last year?
19. guys, on 7B which is a 6 marker, i forgot to differentiate y in the chain rule, i mean i did right but forgot to write down the y so i got 7/4, how many mark will they take out?
20. (Original post by hamza3256)
what overall grade would it be if I get 57/60 for c3, 48/60 for c4 (made loads of silly mistakes), and 61/75 for s1, considering that I got 240/300 last year?
I would say at least a B around 450 ums

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