Edexcel A2 C4 Mathematics June 2015 - Official Thread

thankyou for this :-) I'm impressed with your memory hahaha



me !!!
Let u = 2x
etc etc


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i got -12 too buddy

Yes but I simplified the logs (cant remembere if it asked for it in its simplest form tho)

Yes I did What substitution did you use?

Nice nice thanks !

How many method marks would you get for the implicit diffrentiaion if you didnt solve after the quadratic????

got k=2 instead of k=4, would i get ecf marks?

think that 7a is 1/P-2 - 1/P

anyone?

k was 4?!?!?!?! You sure????

I let $u = 3^{x}$ made it so much easier.

k was 4?!?!?!?! You sure????

I know. I was getting muddled up with someone previously saying it was 3 to the x squared. That is not what I meant at all. I removed the comment, hahaha I look like such an idiot, oops.
It's like saying 2 + 1 doesn't equal 3... oh dear...

i got k was 2.... ?!?!?!!?!

yeah i did that as i havent really done intergation of a^x that much and didnt want to risk screwing it up so I put 3^x equal to u and i got 13pi/ln3 which seems to be what a lot of other people got.

My answers for this paper were:
1) 2+5x/4-25x^2/64
3rt2/2
181/128
2)(2x-3y)/(3x+8y)=dy/dx
+-(24/5,16/5)
3)x=4ln(2)
12+32ln(2)^2-32ln(2)
4) A=5,1,3
p=15
31.82
d=7.46
5)27/32
a=2 b=-5
6)k=4
4pi/3 + rt(3)/2
7) 1/(p-2) - 1/p
0.473
8) x=2 - 1/ln3
area = 13pi/ln3
this is most of the questions that i wrote down my answers to, I am confident in most of them although I am prone to the occasional stupid mistake so if you disagree then I will not argue with you.