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How do I solve the integral int_1^9 sqrt(x^2+4)dx

  1. Nov 12, 2008 #1
    how do i integrate this equation, ie an equation with a complex function- sqared number inside sqr root

    integrate from 1-9

    [tex]\int[/tex][tex]\sqrt{x^2 +4}[/tex]

    what can i substitute?
  2. jcsd
  3. Nov 12, 2008 #2
    Re: integration

    [tex]2 tan(x)[/tex]
  4. Nov 12, 2008 #3
    Re: integration

    how so??
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