# Integration: do I use integration by parts?

• Feb 3rd 2009, 05:19 PM
bam017
Integration: do I use integration by parts?
im trying to integrate 15xe^(-x^2) on [0,1] and I cant figure out what to do. I think you are supposed to integrate by parts, but i cant even figure out where to begin, let alone assing a u or dv.
• Feb 3rd 2009, 05:23 PM
Jhevon
Quote:

Originally Posted by bam017
im trying to integrate 15xe^(-x^2) on [0,1] and I cant figure out what to do. I think you are supposed to integrate by parts, but i cant even figure out where to begin, let alone assing a u or dv.

no. substitution, $u = -x^2$

or get around this by noting that you have

$- \frac {15}2 \cdot -2xe^{-x^2}$

which is of the form $- \frac {15}2 u'e^u$