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Math Help - multiplication of two matrix

  1. #1
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    multiplication of two matrix

    A = | 1 2 |
    3 4

    b = | 1 3 |
    5 7

    a* b = ?
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  2. #2
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  3. #3
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    Hello, ranjitbd!

    If you know how to multiply matrices, exactly where is your difficulty?
    If you don't know how, this is not the place to learn it.


    Gtiven: . A \:=\:\begin{vmatrix} 1&2 \\ 3&4 \end{vmatrix} \qquad B \:=\:\begin{vmatrix}1&3\\5&7 \end{vmatrix}

    Find: . A\cdot B

    A\cdot B \;=\;\begin{vmatrix}1&2\\3&4\end{vmatrix}\, \begin{vmatrix}1&3\\5&7\end{vmatrix} . = \;\begin{vmatrix}(1)(1)+(2)(5) & (1)(3)+(2)(7) \\ (3)(1)+(4)(5) & (3)(3)+(4)(7)\end{vmatrix} \;=\;\begin{vmatrix}11 & 17 \\ 23 & 37 \end{vmatrix}

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  4. #4
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    example of a matrix multiplication

    give me an example
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  5. #5
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    really thanks...

    Quote Originally Posted by ranjitbd View Post
    give me an example
    i know but i have forgotten....just imagine i have completed my 12 standard on april 1999.
    anyway wish u all the best
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