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Homework Help: Simple substitution inigral

  1. Dec 13, 2012 #1
    1. The problem statement, all variables and given/known data
    Initigral (x* dx/((1+x^2)^.5)

    u = 1+x^2
    du = 2xdx

    how do get this to equal the inigral of U^-1/2

    I am drawing a blank for the numerator

    I know how do the problem after I get u^-1/2 .. but i need to know how to get the intigral to form of U^-1/2.. i dont know how to use substition to get to that form
  2. jcsd
  3. Dec 13, 2012 #2
    what is the answer of 1/(4^2)? 0.0625
    now check what is the answer for 4^(-2)? This should give you some direction...
    1/(U^0.5) can then be written how?
  4. Dec 13, 2012 #3
    Yes, i know 1/u^1/2 = U^-1/2

    But how does the numerator = 1
  5. Dec 13, 2012 #4
    if you have anything above the line you can make the numerator 1 and right it next to it. Like 4/6 can be written as 4*(1/6) its the same. Just show me your calcs, and I'll help you.
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