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Math Help - Quick integral question.

  1. #1
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    Quick integral question.

    I have been able to do most of the problems since reading the book but this one is giving me trouble. Thanks.

    Last edited by xcelxp; April 18th 2007 at 05:56 PM.
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  2. #2
    Senior Member ecMathGeek's Avatar
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    Quote Originally Posted by xcelxp View Post
    I have been able to do most of the problems since reading the book but this one is giving me trouble. Thanks.

    let u = 1 + lnx <--> du = 1/x dx --> dx = x du

    INT {a,b} 1/u du = ln|u| for {a,b} = ln|1 + lnx| for {1,e^3} = ln|1 + lne^3| - ln|1 + ln1| = ln4 - ln(1) = ln4
    Last edited by ecMathGeek; April 19th 2007 at 03:36 PM.
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