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Quick integrating question (part of a series question)

  1. Nov 14, 2007 #1
    Quick integrating question....(part of a series question)

    Still studying for my exam...


    Came across this example and I don't know what the method is for integrating this type of problem? (I'm using it to do the integral test for series). How did they get rid of the x^3? thanks for the help :-)

    [​IMG]
     
  2. jcsd
  3. Nov 14, 2007 #2
    Well what's the derivative of -1/3 * exp(-x^3)?
     
  4. Nov 14, 2007 #3

    HallsofIvy

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    Or: let u= x2 so that du= 3x2 dx.
     
  5. Nov 14, 2007 #4
    ahhh...i see it now. thanks :-)
     
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