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# Edexcel A2 C4 Mathematics June 2015 - Official Thread watch

1. (Original post by arsenalfc97)
I integrated 3^2x as 3^2x/In3 which i now realise is wrong. Do i lose all the marks after this? or if i subbed in right etc could i still get some
I did this also Think we'll still get the marks for the cone and for the fact that we were taking the cone volume away from our answer
2. when is arsey coming online
3. If you get the integration right but the final answer wrong how many marks lost?
4. (Original post by qyazd)
how many marks do u have to lose to get an ungradeable
Anything less than around 30-35/75 is a U
5. Judging reactions i'm guessing
A* ~ 68
A ~ 61
B ~ 53
C ~ 47
D ~ 41
E~ 35
What does everyone think?
6. for the first question - binomial expansion
a) 1+ (5/4)x - (5/16)x^2
b) 3/2
c) 679/480

implicit differentiation
a) proof
b)(24/5, 16/5) (-24/5, -16/5)

vectors
u=-1 , a(5,3,1) or something similar, cant remember exactly
lambda = 4 p=15
angle = 31.82
length = 7.06

k=4 for the cos^2x one

27/32 for something else

32ln2 + 12 for something else
this was with the q = 2 - (1/ln3) i think

cartesian equation a= 2 b=-5

t= 0.473

final question volume of revolution i got 13pi/ln3
7. (Original post by Paraphilos)
Sorry, I wouldn't have picked up on it if I knew. If it's any consolation, I make hundreds of ridiculous claims and errors when I do work even at undergraduate level.
No it's not your fault for picking up on it, haha, you were only trying the defend the person. Well I was temporarily unable to count the words in my French essay at the end of that exam because I was shaking so much after 3hrs of stress... The invigilator came over and was like, "Do you need help counting?" I nearly died. I had a STEP exam right after as well... oh the irony.
8. Arseys MS is out he says boundaries around 70 for a*, 64 for and 57 for a B. Think i got full marks on such an easy paper!
9. (Original post by physicsmaths)
4=k
yh I got k=4. seems to be a question that's divided people

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10. (Original post by DoctorDren)
Let me just say 3^x squared is 9^2x. 100% that's correct
would it give a single mark?
11. (Original post by DoctorDren)
Let me just say 3^x squared is 9^2x. 100% that's correct
Substitute x=1 then ...it's not.
12. For the last question i did this instead why is it wrong??

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Attached Images

13. (Original post by Humbers)
I dont know what you've been smoking but that is no where near mathematically correct
Oh dear lord;

This means that:

As stated.

Oh by the way, it's nowhere. For example, you're nowhere near mathematically or grammatically correct.
14. (Original post by regina falange)
I did this also Think we'll still get the marks for the cone and for the fact that we were taking the cone volume away from our answer
I did that too... 6 mark question, we will probably get 2 marks i think

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15. (Original post by tawaz1997)
Attachment 429797

K was actually 4, don't know how I got 2 in the exam after initially getting 4...

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16. Thank you! Needed to mark my C3....
17. Did anyone else (24/5,16/5) for where DY/DX= 0? (Q2)
18. (Original post by jacalv)
Arseys MS is out he says boundaries around 70 for a*, 64 for and 57 for a B. Think i got full marks on such an easy paper!
stop ch*tting **** you little imbecile
19. (Original post by _jess)
for the first question - binomial expansion
a) 1+ (5/4)x - (5/16)x^2
b) 3/2
c) 679/480

implicit differentiation
a) proof
b)(24/5, 16/5) (-24/5, -16/5)

vectors
u=-1 , a(5,3,1) or something similar, cant remember exactly
lambda = 4 p=15
angle = 31.82
length = 7.06

k=4 for the cos^2x one

27/32 for something else

32ln2 + 12 for something else
this was with the q = 2 - (1/ln3) i think

cartesian equation a= 2 b=-5

t= 0.473

final question volume of revolution i got 13pi/ln3
I think you binomials' wrong, rest looks good though

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