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# Core 4 - integration help!! :S watch

1. hi guys

i really cant work out how to integrate : (3 / (1 + x)^2)
can any of you guys help
2. = 3(1+x)^-2

u = 1+x therefore du = dx
3(u)^-2.du integrate gives...
-3(u)^-1
= -3(1+x)^-1
3. have you tried substitution with u=1+x?
4. (Original post by tulcod)
have you tried substitution with u=1+x?
oh..good idea
5. (Original post by tulcod)
have you tried substitution with u=1+x?
This is the best suggestion, do this.
6. Personally, I think the best way would be to do it by inspection....
7. (Original post by Ewan)
This is the best suggestion, do this.
with all due respect, it's exactly the method freakonomics123 used :P
8. thanks everyone
9. Reverse chain rule that bad boy
10. (Original post by tulcod)
with all due respect, it's exactly the method freakonomics123 used :P
I was being serious -.-
11. lol function of x is linear, so go ahead and integrate it (+ the power, divide by ....)
12. i have another issue with another question... can any of you guys help
http://www.thestudentroom.co.uk/show...php?p=30430910

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