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

1. (Original post by JRN-95)
how because the equation is y^3 + 2e^(-3x)y + x = k so you'll end up with
(1/2)^3+2e^-3ln(2) * 1/2 + ln2=k
It was - x not + x.
2. (Original post by Jed-Singh)
yeah fair comments, but there were some tricky questions and obviously vectors is a whole different matter. I don't think 65 will be an A* as like I said a 6 mark increase suggests the paper wasn't challenging to most people. whereas general consensus is the exam is tough but fair, so yeah maybe 61/62 A* highest
for the x=-1/8 i solved it for X with quadratic values instead of sin/cos and got the right value so im thinking since i did it a different way would i lose all 5 marks? right now im thinking i got 60/75 ish but with that 65/75
3. (Original post by Jed-Singh)
CD223 mate, might be worth double checking vectors part incase im right, but tbh the way todays been I doubt it lol
hi there, everyone is saying they got 4 for lambda (the vector question) but how?

I redid it like 5 times as got the same fraction
4. I'm looking at minimum 65 and maximum 67 marks, I think (should have been an easy 70+ but did some really silly things that lost me 1/2 marks here and there).

D'you guys thing 65 will be enough for at least 88 ums or so, for an A* overall ?
5. (Original post by datpr0)
It was - x not + x.
Ah okay it says +x on the unofficial mark scheme so i got a bit worried
6. (Original post by CD223)
Was C (15, 6, 2) or (15, 6, -2)?

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yeah seem to remember one of the two
7. (Original post by Chung224)
for the x=-1/8 i solved it for X with quadratic values instead of sin/cos and got the right value so im thinking since i did it a different way would i lose all 5 marks? right now im thinking i got 60/75 ish but with that 65/75
They stated that you needed to form a quadratic in sinq, but provided you said something along the lines of "let X = sinq" and you indeed came out with -1/8 as the final answer (-3/4 for the quadratic), I expect you'd get full credit.
8. (Original post by datpr0)
I'm looking at minimum 65 and maximum 67 marks, I think (should have been an easy 70+ but did some really silly things that lost me 1/2 marks here and there).

D'you guys thing 65 will be enough for at least 88 ums or so, for an A* overall ?
65 will be an A* for sure imo. Thats an excellent mark.
9. (Original post by Kennethm)
65 will be an A* for sure imo. Thats an excellent mark.
What do you think the boundary will be? For 90? I struggled so I just wanna scrape it lol.

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10. (Original post by datpr0)
They stated that you needed to form a quadratic in sinq, but provided you said something along the lines of "let X = sinq" and you indeed came out with -1/8 as the final answer (-3/4 for the quadratic), I expect you'd get full credit.
damn i didn't say let X=sinq I'm just gonna be pesismistic so my exam results don't hit me as hard XD
11. (Original post by CD223)
Was C (15, 6, 2) or (15, 6, -2)?

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I think it was the -2
12. (Original post by CD223)
What do you think the boundary will be? For 90? I struggled so I just wanna scrape it lol.

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Honestly no idea bro we are on the same boat - pretty sure i got 62 because of the dumbest mistakes haha. what do you think you got?
13. Oh no, for the differential question, I put the equation in terms x and not t! How many marks max do you think I could get??

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14. (Original post by Kennethm)
Honestly no idea bro we are on the same boat - pretty sure i got 62 because of the dumbest mistakes haha. what do you think you got?
Like 62 if I'm lucky mate. That paper threw me. Totally different reaction compared to C3!

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15. (Original post by JellyCat99)
Oh no, for the differential question, I put the equation in terms x and not t! How many marks max do you think I could get??

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Wasn't it x in terms of t?

EDIT: sorry I misunderstood. Doing that far too much today! You should get the majority?

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16. (Original post by datpr0)
They stated that you needed to form a quadratic in sinq, but provided you said something along the lines of "let X = sinq" and you indeed came out with -1/8 as the final answer (-3/4 for the quadratic), I expect you'd get full credit.
yh i did something along the lines of equating the equation with x with the equatioin for x interms of t. and thane xchanging some other thing for x/t and i ended up with a fairly even number, which i think was -1/8 hopefully so i left it at that, had no clue how to approach it using quadratics.

i understood everything else apart from that. BUT, im jjust wondering did every find everyone find E by using D +/- AC?
17. could anyone tell me how they got 11/8 for question 7bii ?? thank you
18. (Original post by CD223)
Wasn't it x in terms of t?

EDIT: sorry I misunderstood. Doing that far too much today! You should get the majority?

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yes it was
19. (Original post by Chung224)
damn i didn't say let X=sinq I'm just gonna be pesismistic so my exam results don't hit me as hard XD
Awh . Well hopefully you have a nice examiner or the mark scheme isn't too strict so they give you the marks by assumption, without you having explicitly stated X = sinq !
20. (Original post by CD223)
Wasn't it x in terms of t?

EDIT: sorry I misunderstood. Doing that far too much today! You should get the majority?

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If you mean the radius question (8a) it was r and t, but the question earlier on was x and t

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