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March 19th, 2011, 10:58 PM   #1
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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
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March 20th, 2011, 03:01 AM   #2
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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.

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March 25th, 2011, 07:53 PM   #3
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Re: crazy partial fraction integral

thank you so much, why didn't i think about using u substitution !!!
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