# Integration by parts ! can you solve this problem please

1. Mar 28, 2012

### idir93

calculate : ∫x²e-x3dx by parts please i need details :) thank you very much

Last edited: Mar 28, 2012
2. Mar 28, 2012

### HallsofIvy

Staff Emeritus
Re: integration by parts ! can you solve this problem plz

Don't use integration by parts!! Let $u= x^3$.

3. Mar 28, 2012

### aeroplane

Re: integration by parts ! can you solve this problem plz

Is it necessary to solve this using integration by parts? There's a nice substitution that makes the integral straightforward. I couldn't easily see a nice way to separate the integral.

4. Mar 28, 2012

### idir93

Re: integration by parts ! can you solve this problem plz

i know that i can do it with u-substitution but i'm asked to integrate it by parts !

5. Mar 28, 2012

### HallsofIvy

Staff Emeritus
Re: integration by parts ! can you solve this problem plz

Then let u= 1/3, $dv= 3x^2e^{-x^3}$

6. Mar 28, 2012

### idir93

i do not think that it's legal :) i mean that there is surely another method thank you anyway