How Can Integral Substitutions Simplify \(\int \frac{dx}{x^{2} e^{-2/x}}\)?

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Homework Statement


\int \frac{dx}{x^{2} e^{\frac{-2}{x}}}

The Attempt at a Solution


I'm not sure where to begin.
 
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Have you tried any substitutions?
 
What happens if you make a substitution, say: u = =\frac{2}{x} ?
 
I got it with u = -2/x, thanks. I'm not sure why I didn't do that in the first place.
 

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