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Math Help - Integral help

  1. #1
    Junior Member
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    Dec 2009
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    Integral help

    evaluate the integral 1/2x at interval (1,9).

    I know the derivative of the integral is ln(x) + C...but I can't figure out how to solve it after spending so much time....

    I assumed you would do this..

    2*ln(9) - 2*ln(1)...but it's wrong as I got 2*ln(8) and the answer is ln(3). Please help!
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  2. #2
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    it is (1/2)ln(9)- (1/2)ln(1)
    The first step you do is move the 1/2 outside the integral so it just gives you 1/x inside the integral
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  3. #3
    Junior Member
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    Dec 2009
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    Ok, then you make it ln(9)^ (1/2) right to get ln(3)..that's how I got to the answer, but it makes more sense now..thanks
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