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Integral question

  1. Jan 15, 2009 #1
    I am having problems figuring out how to do this integral.
    [tex]\int[/tex]x(x2-4)1/2dx

    I know what the answer is, but I am not sure how to get there. I am not sure if there is a method or if you just need to do it by logic. I tried integration by parts but I just cant get to something I can integrate.

    Thanks.
     
  2. jcsd
  3. Jan 15, 2009 #2

    mathman

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    Gold Member

    try y=x2-4. Then dy=2xdx. Now you are left with integrating (y1/2)/2. You should be able to do that.
     
  4. Jan 15, 2009 #3
    You probably COULD do it by parts? But that's clearly overkill. Like mathman pointed out, this screams u-subst.
     
  5. Jan 15, 2009 #4
    Thanks. U substitution. Its been too long since I have done this. Thanks.
     
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