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Math Help - COMPUTE MATRIX

  1. #1
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    COMPUTE MATRIX

    COMPUTE AB AND BA IF POSSIBLE

    1 2 3 =A
    -4 -2 5



    1 2 1
    -4 5 -2 =B
    0 3 -1
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  2. #2
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    Quote Originally Posted by waterboy View Post
    COMPUTE AB AND BA IF POSSIBLE

    1 2 3 =A
    -4 -2 5



    1 2 1
    -4 5 -2 =B
    0 3 -1
    A=\left[\begin{array}{ccc}1 & 2 & 3 \\ -4 & -2 & 5 \end{array}\right]

    B=\left[\begin{array}{ccc}1 & 2 & 1 \\ -4 & 5 & 2 \\ 0 & 3 & -1 \end{array}\right]

    AB=\left[\begin{array}{ccc}-7 & 21 & -6 \\ 4 & -3 & -5 \end{array}\right]

    BA is not possible because B is a 3 x 3 matrix and A is a 2 x 3, so we have a dimension mismatch.
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