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Math Help - Matrix Problem

  1. #1
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    Matrix Problem

    I'm having problems with this matrix problem. Can anyone help me?


    A= 1 1
    = 1 1

    B= 3 -2 2
    = 6 -2 3

    Find A.B
    Last edited by Wildman; February 22nd 2010 at 10:58 PM. Reason: wrong brackets
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  2. #2
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    Quote Originally Posted by Wildman View Post
    I'm having problems with this matrix problem. Can anyone help me?


    A= 1 1
    = 1 1

    B= 3 -2 2
    = 6 -2 3

    Find A.B
    A = \left[\begin{matrix}1 & 1 \\ 1 & 1\end{matrix}\right]

    B = \left[\begin{matrix}3 & -2 & 2\\ 6 & -2 & 3\end{matrix}\right]


    AB =  \left[\begin{matrix}1 & 1 \\ 1 & 1\end{matrix}\right]\left[\begin{matrix}3 & -2 & 2\\ 6 & -2 & 3\end{matrix}\right]

     = \left[\begin{matrix}1\cdot 3 + 1\cdot 6 & -2\cdot 1 + (-2)\cdot 1 & 2\cdot 1 + 2\cdot 3 \\ 1\cdot 3 + 1\cdot 6 & -2\cdot 1 + (-2)\cdot 1 & 2\cdot 1 + 2\cdot 3\end{matrix}\right]

     = \left[\begin{matrix}9 & -4 & 8 \\ 9 & -4 & 8\end{matrix}\right]
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  3. #3
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    Thanks for the quick reply help me out alot.
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