March 19th, 2011, 10:58 PM  #1 
Member Joined: Aug 2009 Posts: 41 Thanks: 0  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 
March 20th, 2011, 03:01 AM  #2 
Senior Member Joined: Feb 2009 From: Adelaide, Australia Posts: 1,519 Thanks: 3  Re: crazy partial fraction integral Don't use partial fractions for this one, just set u = 3x+7, so du = 3 dx and x = (u7)/3. 
March 25th, 2011, 07:53 PM  #3 
Member Joined: Aug 2009 Posts: 41 Thanks: 0  Re: crazy partial fraction integral
thank you so much, why didn't i think about using u substitution !!! 

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