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Math Help - calculating definate intregals

  1. #1
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    calculating definate intregals

    Let .
    Find
    and Let .

    Find
    and


    So I found the first one, which is just 0.

    How do I find the seecond one? I don't get the logic of it...
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  2. #2
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    <br />
\int_{-1}^{-3.5}(10f(x)-3)dx=-\int_{-3.5}^{-1}(10f(x)-3)dx=-10\int_{-3.5}^{-1}f(x)dx+3\int_{-3.5}^{-1}dx<br />
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  3. #3
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    wouldn't it just be -10 (0) + 3(0) which is just zero? but that answer is wrong...
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  4. #4
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    <br />
\int_{-3.5}^{-1}dx=x|_{-3.5}^{-1}=(-1)-(-3.5)=2.5<br />
    Last edited by zzzoak; February 12th 2011 at 01:36 AM.
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  5. #5
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    Sorry I still don't get it. What is dx or x in this problem? If I wsa given that, I could figure it ou, I know how to be integration...
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