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 February 22nd, 2009, 08:07 PM #1 Newbie   Joined: Feb 2009 Posts: 21 Thanks: 0 Improper integral -infinity S xe^-x^2 //READ AS : x times e to the power of - x squared infinity I don't think I could use integration by parts. so I am confused. I could split the limits into two but...?
 February 22nd, 2009, 08:42 PM #2 Senior Member   Joined: Dec 2008 Posts: 306 Thanks: 0 Re: Improper integral Split it into two integrals $\int_{0}^{\infty}f$ and $\int_{-\infty}^{0}f$. Use a u sub to find the integrals.
February 23rd, 2009, 02:12 PM   #3
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Re: Improper integral

Quote:
 Originally Posted by tnutty -infinity S xe^-x^2 //READ AS : x times e to the power of - x squared infinity I don't think I could use integration by parts. so I am confused. I could split the limits into two but...?
Your problem statement is incomplete. Do you want indefinite integral or definite integral? If you want definite integral, what limits?

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