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Math Help - Help with improper integrals

  1. #1
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    Help with improper integrals

    the integral from neg. infinity to 6 of re^(r/3)

    thanks!
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  2. #2
    Behold, the power of SARDINES!
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    \int_{-\infty}^6re^{\frac{r}{3}}dr=\lim_{a\to-\infty}\int_a^6rd^{\frac{r}{3}}=

    \lim_{a\to-\infty}3re^{\frac{r}{3}}-9e^{\frac{r}{3}}|_{a}^{6}

    I used integration by parts
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