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Definite Integral [help]

  1. Jan 23, 2008 #1
    Definite Integral [help] !!!

    hello, can anyone help me how to complete the following definite integral? Thanks!!
    ∫ (x^2)*sqrt(7 x + 9) dx (From 0 to 1)
     
    Last edited: Jan 23, 2008
  2. jcsd
  3. Jan 23, 2008 #2
    Try the substitution

    [tex]\sqrt{7x+9}=y[/tex]
     
  4. Jan 23, 2008 #3
    sorry, I still can't figure out it, can you give me some more detail? thanks a lot .
     
  5. Jan 23, 2008 #4

    HallsofIvy

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    If [itex]y= \sqrt{7x+ 9}[/itex], what is dx (in terms of dy and y)? What is x in terms of y? (So you can substitute for that x2.)
     
  6. Jan 23, 2008 #5
    I got it, thanks for help!! ^-^
     
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