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Math Help - I tried evaluating this integral sooo many times and keep getting it wrong!

  1. #1
    s3a
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    I tried evaluating this integral sooo many times and keep getting it wrong!

    I am trying to evaluate this integral and keep getting it wrong: http://www.wolframalpha.com/input/?i...C+from+-1+to+0

    I would greatly appreciate it if someone could point out what I am doing wrong. (My work is attached)

    Thanks in advance!
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    Last edited by mr fantastic; March 5th 2010 at 10:57 PM. Reason: Added url tags.
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  2. #2
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    second line ...

    \int \frac{4x+9}{x^2+10x+21} \, dx \ne \int \frac{2(2x+10)}{x^2+10x+21} \, dx - \int \frac{4}{x^2+10x+21} \, dx

    correction ...

    \int \frac{4x+9}{x^2+10x+21} \, dx = \int \frac{2(2x+10)}{x^2+10x+21} \, dx - \int \frac{11}{x^2+10x+21} \, dx
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