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Help calculus

  1. Oct 5, 2007 #1
    1. The problem statement, all variables and given/known data

    [tex]\int4x^-3*ln(9x)[/tex]

    2. Relevant equations

    [tex]\int u'*v = u*v - \int u*v'[/tex]

    3. The attempt at a solution

    i know the answer is [tex]\frac{-2ln(9x)-1}{x^2}[/tex]

    but i dont understand the step [tex]\int u*v'[/tex]

    if any could help me....thanks
     
  2. jcsd
  3. Oct 5, 2007 #2

    mjsd

    User Avatar
    Homework Helper

    what don't you understand

    u means u
    [tex]v'[/tex] means [tex]dv[/tex]
     
  4. Oct 5, 2007 #3
    Solved

    thks i understand now
     
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