Qualification > Math

C3 and C4 DOUBTS HERE!!!

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hmh:
Can anyone please do C4 January 2011 Question 7 C.

abuelzouz:

--- Quote from: hmh on June 19, 2011, 05:22:36 pm ---Can anyone please do C4 January 2011 Question 7 C.

--- End quote ---

i will solve this paper now and post solution

abuelzouz:

--- Quote from: hmh on June 19, 2011, 05:22:36 pm ---Can anyone please do C4 January 2011 Question 7 C.

--- End quote ---

k so here is it
dx/du = 2(u-4)
dx= 2(u-4) du
x-1 = (u-4)^2
so root x-1 = u-4
and u= root x-1 +4

going back to equation
substitute
integral = integral 1/u & 2(u-4) du
= integral (2-8/u) du
= 2u- 8ln u
x=2 so u=5
x=5 so  u=6
substitute these values to get area
thats it hope i helped

hmh:
Thanks, I just couldn't get the limits correct but now I know how to do it.

WARRIOR:
Hi guys , can anyone get me the answers of these questions ? all of them :P

thanks

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