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imagreencat

We were to asked to get the integral from 0 to infinity of (dx)/(sqrt(x))(x+1). I don't know if I should use the infinite intervals AND the discontinuous integrand or should I just go with one?

  • one year ago
  • one year ago

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  1. lgbasallote
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    split them up first

    • one year ago
  2. lgbasallote
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    1 to infity and 0 to 1 should work

    • one year ago
  3. imagreencat
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    So I would split them up first, then use an infinite interval from 1 to infinity and the discontinuous integrand from 0 to 1? :)

    • one year ago
  4. lgbasallote
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    yep

    • one year ago
  5. imagreencat
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    Okay. Thanks so much for the help!!

    • one year ago
  6. PaxPolaris
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    \[\large \int\limits_{0}^{\infty}{dx \over \sqrt {x} \left( x+1 \right)}\]??

    • one year ago
  7. PaxPolaris
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    substitute \(\large \sqrt x = u\) and \(\large du =\Large \frac 12 \cdot\frac 1 {\sqrt x}\) \[\Large = 2\int\limits_0^\infty {1 \over u^2+1}du \] \[\Large = \left[ 2\tan^{-1}(u) \right]_0^\infty=2 \cdot \frac \pi 2-0 = \Huge\pi\]

    • one year ago
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