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Homework Help: Integral substitutions question help

  1. Jun 23, 2007 #1
    1. The problem statement, all variables and given/known data
    [tex]\int \frac{dx}{x^{2} e^{\frac{-2}{x}}}[/tex]

    3. The attempt at a solution
    I'm not sure where to begin.
    Last edited: Jun 23, 2007
  2. jcsd
  3. Jun 23, 2007 #2
    Have you tried any substitutions?
  4. Jun 23, 2007 #3
    What happens if you make a substitution, say: [itex] u = =\frac{2}{x} [/itex] ?
  5. Jun 23, 2007 #4
    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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