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Edexcel A2 C4 Mathematics June 2015 - Official Thread Watch

1. (Original post by Nurishment)
It was to x^2 I'm afraid, but they won't penalise you for it.
Ahh damn but ty, for part c) did you get 5/3?
2. how do you even integrate 9^x^2 like pls.
3. (Original post by varshanct95)
who got 2 + 5/4x - 25/64 x^2 for the first question binomial expansion
Snap x
4. (Original post by JulianS96)
I got the same thing too.
Something like 12000 -6 = 4000e^1/2sin2t
Then ln2.9985 = 1/2sin2t
Therefor 2ln2.9985 = sin2t
Therefore 2t equals Math Error
Hopefully we would of got one method mark, but apparently the population was in thousands.
5. (Original post by JulianS96)
I got the same thing too.
Something like 12000 -6 = 4000e^1/2sin2t
Then ln2.9985 = 1/2sin2t
Therefor 2ln2.9985 = sin2t
Therefore 2t equals Math Error
p was in thousands so you had to put p=4 in! I did this too then realised !

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6. (Original post by rachelc142)
:-D congrats dude

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Cheers, 75 in both C3/4. Whooh with bo pst past papers 😂

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7. (Original post by physicsmaths)
75/75

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76/75
8. I've been **** at C4 all year so I'm really pleased with how this paper went, will check when Arsey does his thing but I reckon I'm on 45-50/75 which should secure my B.
9. We said that the radius of the cone was 2 when it was actually 9 😢
10. Paper was Alright not sure its good enough though to compensate for C3 and bring it up to an A*.
Thank you God for the easy vector questions.
I noticed P was in thousands in the last minute of the paper. I got a dodgy answer for the final question. When you guys calculate the Volume of the cone 1/3 (pi) r2h is h=9 and r= ln3?
11. (Original post by talkbiology)
I got the same
it was harder than usual in my opinion, the Cartesian equation from the parametrics was tricky, and on the DE question for part c) I didn't realise it was in thousands so couldn't do it! Question 8 was certainly tricky. Comparing my answers with people on here, so far so good, which is a massive relief because on C4 I never know if I've got things right or not!
Yeah I almost made the mistake for the P = 4000 but quickly corrected it to get the answer. I expect standard grade boundaries but I only need an A for A* overall which I'm confident I got. Hopefully edexcel are kind
12. (Original post by jf1994)
76/75
Damniy

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13. Lost a good 12 marks or so on that.
14. (Original post by abigail love)
how do you even integrate 9^x^2 like pls.
Should of got 32x which can be integrated pretty easily using substation
16. (Original post by abigail love)
how do you even integrate 9^x^2 like pls.
Do you mean ? I would be surprised if they really asked you integrate that..
17. (Original post by cogito.)
NO, if you use degrees you will get M0 A0 for final 2 marks because degree is not alternative method but the WRONG method.
I know it's wrong! But sometimes the mark scheme is lenient in this case. I'm trying to find the example I found earlier.
18. (Original post by Paraphilos)
Do you mean ?
yeah
19. I feel gutted, not because I've done badly but because this paper was a paper where if you did your revision ie all the past papers and Solomon papers at least you should have been able to get 75/75.

If I had spent my time on c4 instead of spending my time on the gamble that is c3 I would have made an A* this year but there is hope at least
20. How many marks do people reckon I will lose if I forgot to multiply the volume by pi, on Q8?

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