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

1. (Original post by matthew6665)
Last question on JUNE 2010 is solid... :s Differential equation , i did the first step to separate them to both sides, but how did they integrate dx/Root(x+1) ..
If u did that question could you give me an idea what to do ? Q8 (a)
I've not done it, but by what you've said surely is just 1/(x+1)^0.5 dx, which is (x+1)^-0.5 dx, and then you just use the reverse chain rule?
2. (Original post by matthew6665)
Last question on JUNE 2010 is solid... :s Differential equation , i did the first step to separate them to both sides, but how did they integrate dx/Root(x+1) ..
If u did that question could you give me an idea what to do ? Q8 (a)

That's Q8(a)
Dx/root(x+1) = 1/(x+1)^1/2 = (x+1)^-1/2 and then you integrate by adding 1 and dividing by new power. Hope it helps
Do you need the rest of the question too?

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3. Hi guys, hope everyone's revision is going ok, after the shocking attempt at c3, I really have to do well in c4 to pull the marks up, is there any tips or advice you would give or what questions to give a try, I would really appreciate some advice
thanks
4. On Q8bii January 2011 (vectors) there's a question asking to find the coordinates of a point, but before doing this you have to find the value of p so that you can then sub it back into the original equation. However, because you form a quadratic equation, there are two values for p that you obtain. In the mark scheme it shows these two values but then goes on to using just one of the p values and subbing it in, without any justification. So how are you meant to know which of the two values to sub in?
5. For some binomial expansion questions I have seen, they add 1 mark onto the end such as:Attachment 420925420929
Why is this the case?
Attached Images

6. can someone help me figure question 2 a out please?
7. Are we supposed to know how to calculate the area of triangles, trapeziums etc with vectors because if so do you just use the magnitudes? :/
Are we supposed to know how to calculate the area of triangles, trapeziums etc with vectors because if so do you just use the magnitudes? :/
I very much doubt it,they're in 3 dimensions
9. (Original post by Dankmeme420)
I very much doubt it,they're in 3 dimensions
Okay thanks, im so worried about the vectors question :-(. On the pilot paper you had to calculate the area of a circle segment, got me worried haha
10. hey guys i was doing a question and got stuck.... could you help?

if cosA=3/5 and sinB=5/13, where A is acute and B is obtuse, find the exact value of..

1) cos(A+B)

2) tan(A-B)

3) sin(A+B)

really frustrated at that obtuse thing, any help?
11. What's the hardest C4 question ever on aqa?
hey guys i was doing a question and got stuck.... could you help?

if cosA=3/5 and sinB=5/13, where A is acute and B is obtuse, find the exact value of..

1) cos(A+B)

2) tan(A-B)

3) sin(A+B)

really frustrated at that obtuse thing, any help?
13. (Original post by JRN-95)
Hi, basically if you know how to use the CAST diagram it helps, or just learn that from 90degrees to 180degrees only sin is positive and tan and cos are negative, if this helps, if you need any more help let me know
thanks
Hi, basically if you know how to use the CAST diagram it helps, or just learn that from 90degrees to 180degrees only sin is positive and tan and cos are negative, if this helps, if you need any more help let me know
thanks
I've done the questions I just wanted to see if my answers are correct before I try and explain anything
15. (Original post by ubisoft)
What's the hardest C4 question ever on aqa?
In terms of numbers of marks this is interesting

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16. (Original post by CD223)
In terms of numbers of marks this is interesting

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To say this carries 12 marks, it isn't actually that bad!
17. (Original post by Gymnast)
To say this carries 12 marks, it isn't actually that bad!
It isn't! I'd like it in the exam

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18. Or this one,

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19. (Original post by Gymnast)
To say this carries 12 marks, it isn't actually that bad!
Ive done this one and wondered if you could show me your solution to see if ive got it correct?
20. (Original post by CD223)
Or this one,

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Which papers are those two questions from? Do you have your solutions for these as id like to compare how we did them

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