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- how do I evaluate this integral?

  1. Oct 2, 2007 #1
    URGENT - how do I evaluate this integral?

    integral from 1 to 4 of sqrt(x)*ln (x) dx

    I tried parts but didn't work

    Does anyone know?
     
  2. jcsd
  3. Oct 2, 2007 #2

    arildno

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    Sure it works!
    Remember that [tex]\frac{d}{dx}\frac{2}{3}x^{\frac{3}{2}}=x^{\frac{1}{2}}=\sqrt{x}[/tex]
     
  4. Oct 2, 2007 #3
    The answer is 16/3ln4 - 28/9

    WHen i get to int vdu , I have int sqrt(x)*1/x dx, is this right?

    Do i just subtract the exponents from here?
     
  5. Oct 2, 2007 #4

    rock.freak667

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    yes....
     
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