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Tiome_nguyen March 19th, 2011 10:58 PM

crazy partial fraction integral
 
integral of (x)dx/((3x+7)^3)

i have no idea how to solve for this integral , i'm learning integral by partial fraction and this is the hardest one that i can't do :( , if u know how to solve , please help me , thank you so much

aswoods March 20th, 2011 03:01 AM

Re: crazy partial fraction integral
 


Don't use partial fractions for this one, just set u = 3x+7, so du = 3 dx and x = (u-7)/3.


Tiome_nguyen March 25th, 2011 07:53 PM

Re: crazy partial fraction integral
 
thank you so much, why didn't i think about using u substitution !!! :)


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