- #1

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## Homework Statement

Find [tex]\int\int\int\sqrt{x^2+y^2+z^2}e^{-x^2-y^2-z^2}dxdydz[/tex]

The limits of integration for all 3 variables are from -infinity to infinity.

## Homework Equations

This one has me completely stumped, so I'm just wondering if someone could push me in the right direction in how to solve this one. I thought about maybe finding a suitable substitution for the region of integration but I'm not sure at how that might work.

Thanks