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Math Help - Matrix co-factors

  1. #1
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    Matrix co-factors

    In an exercise in my linear algebra book, I'm supposed to find all the co-factors for the matrix:

    1 -2 3
    6 7 -1
    -3 1 4

    I've got all of them right, except C31, and C32.

    The answers I got, were:

    C31 = 23, C32 = -17

    According to the book, the correct answer is:

    C31 = -19, C32 = 19

    Am I wrong or is there an error in the book?

    Thanks!
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  2. #2
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    Re: Matrix co-factors

    No, you're wrong. Check the definition again and tell us what you have done: Cofactor.
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  3. #3
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    Re: Matrix co-factors

    Thanks, for some reason I started adding the terms instead of subtracting when figuring out the minor entries!
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