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anonymous

  • 5 years ago

∫ x^3 e^-x dx integrate using the appropriate technique of integration.

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  1. anonymous
    • 5 years ago
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    Use some integration by parts on that guy; let u = x^3 and v'=e^-x.

  2. anonymous
    • 5 years ago
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    ok.. u=x^3 v=e^-x u'=3x^2 v'= ...????

  3. anonymous
    • 5 years ago
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    No, dv/dx = e^-x. You can't set v without first setting v', when doing integration by parts.

  4. anonymous
    • 5 years ago
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    You're going to end up doing that type of integration 2 or 3 times if I'm not mistaken; unless you're familiar with tabular integration.

  5. anonymous
    • 5 years ago
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    ∫ U dV = UV -∫ V dU ???? thats right..???

  6. anonymous
    • 5 years ago
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    Yes, once you get that second ∫v du you're going to get another ugly one, so do integration parts on that one too.

  7. anonymous
    • 5 years ago
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    ohhhh... confius..

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