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# Edexcel A2 C4 Mathematics June 2015 - Official Thread watch

1. (Original post by gGinaa)
I did that too... 6 mark question, we will probably get 2 marks i think

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Nah I think maybe 3/4
2. So 3^2 x 3^2 = 9^4? Nice logic bro x
3. Yes :-) my friend got the same but not over 5?
4. Anyone else miss Q9? Can't believe that..
5. (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!
Stupid liar...

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6. (Original post by DoctorDren)
Let me just say 3^x squared is 9^2x. 100% that's correct
(3^x)^2=(3^x)(3^x)

using indices rules

=3^2x

http://www.wolframalpha.com/input/?i=%283%5Ex%29%5E2

or 9^x
7. (Original post by thatcomputergu)
Did anyone else (24/5,16/5) for where DY/DX= 0? (Q2)
yes but also -24/5, -16/5 :-)

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8. (Original post by DoctorDren)
Let me just say 3^x squared is 9^2x. 100% that's correct
You took maths A level and you think this? I advise you to dig out a KS2 maths book. Your maths fundemantals are very lacking if this is what you think.
9. (Original post by thatcomputergu)
Did anyone else (24/5,16/5) for where DY/DX= 0? (Q2)
ye i did that aswell.

But i fkin forgot about the square root so it is +-
10. Do you guys think i can get an A* if I have 68-C3 67-C4.
11. (Original post by Isaac639)
So 3^2 x 3^2 = 9^4? Nice logic bro x
There's no need to be mean about it..
12. is there an unofficial mark scheme floating about anywhere
13. (Original post by DoctorDren)
Let me just say 3^x squared is 9^2x. 100% that's correct
Sorry... it's actually not. It's 3^2x. (or 9^x)

3^x squared = 3^x times 3^x = 3^(x+x) = 3^2x, or 9^x if you like. But not 9^2x, nope.

This time I'm definitely not talking nonsense.
14. (Original post by Ohwhenwilson)
Judging reactions i'm guessing
A* ~ 68
A ~ 61
B ~ 53
C ~ 47
D ~ 41
E~ 35
What does everyone think?
I found it was slightly harder than last years tbh... maybe it was the wording...
last years was
A*66 A 59 B 52 C 46 D 40 E 34
I reckon the grade boundaries may be a little lower... maybe A* 64 A57, B50 C44 D 36 E32
that;s my opinion anyway.. what does everyone else think?
15. (Original post by Gome44)
I think you binomials' wrong, rest looks good though
I got 60 something for the angle
16. I put my calculator in degree mode for the population one and got 27 years i think, in radians it wouldv'e been too short of a time wouldn't it?
17. (Original post by aero-1997)
Do you guys think i can get an A* if I have 68-C3 67-C4.
Probably.
18. Flopped that paper so badly. Does anyone know the requirements for an A & for a B (i.e what UMS do you need/average)?
19. Could someone check this is right please?
for the last question,
y= 3^x, dy/dx = 3^xln3
when x =2 dy/dx = 9ln3
so tangent=
y-9=9ln3(x-2)
y= 9ln3x-18ln3+9
so it cuts the x axis where
9ln3x-18ln3+9=0
9ln3x= 9-18ln3
ln3x= 1-2ln3
3x= e^1-2ln3
3x= e/ln9
x = e/3ln9
20. (Original post by Fanta4TheBanter)
Probably.
Can't say for definite until the grade boundaries are set.

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