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Homework Help: Integral of e^(-ax) from evaluated between neg/pos infinity

  1. Apr 27, 2010 #1
    Hey guys I am working on a Physics problem and can't figure out a little but of math involved. What is this integral? I tried it out and got "1/a + a", assuming "1/a" is the positive half of the integral.
  2. jcsd
  3. Apr 27, 2010 #2
    The integral is infinite.
  4. Apr 27, 2010 #3
    Graph [tex] f(x) = e^{-x} [/tex] and see if you can tell what the area under it is.
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