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Math Help - A little algebraic thing I don't get in this math video

  1. #1
    s3a
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    A little algebraic thing I don't get in this math video

    In this video (Improper Integral with an Infinite Discontinuity in the interval), at 2:48, I don't understand how he gets -ln(2) because I would of gotten -ln|e^(-1) - 1|.

    Any input would be greatly appreciated!
    Thanks in advance!
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  2. #2
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    Quote Originally Posted by s3a View Post
    In this video (Improper Integral with an Infinite Discontinuity in the interval), at 2:48, I don't understand how he gets -ln(2) because I would of gotten -ln|e^(-1) - 1|.

    Any input would be greatly appreciated!
    Thanks in advance!
    You are correct.
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  3. #3
    s3a
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    Is he also correct though?
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    Quote Originally Posted by s3a View Post
    Is he also correct though?
    I don't think so. ln(e^-x - 1) cannot be equal to ln(-x -1) at x = -1.
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