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Math Help - Multiplying matrices

  1. #1
    Junior Member
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    Multiplying matrices

    How are they arriving at the solution multiplying the following 3 matrices?

    2/5 0 3/5 | 5 -1 | 0
    ---------- | 2 3 | 1
    ---------- | 1 5 |

    = 13/15

    I've done multiplied 3 before.
    2/5(5) + 0(2) + 3/5(1) + 2/5(-1) + 0(3) + 3/5(5) = 4
    0(5) + 1(-1) + 0(2) + 1(3) + 0(1) + 1(5) = 7
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  2. #2
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    Hello, hansfordmc!

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    QUOTE

    How are they arriving at the solution?

    . . . . . . . . . . . | 5 -1 |
    | 2/5 0 3/5 | * | 2 .3 | * | 0 | . = . 13/15 . ??
    . . . . . . . . . . . | 1 .5 | . .| 1 |


    I've done multiplied 3 before.

    (2/5)(5) + 0(2) + (3/5)(1) + (2/5)(-1) + 0(3) + 3/5(5) .= .4

    . . .(0)(5) + (1)(-1) + (0)(2) + (1)(3) + (0)(1) + (1)(5) .= .7

    I have no idea what all this is . . .

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    . . . . . . . . . . . | 5 -1 |
    | 2/5 0 3/5 | * | 2 .3 |
    . . . . . . . . . . . | 1 .5 |

    . . . = . | (2/5)(5) + (0)(2) + (3/5)(1) . (2/5)(-1) + (0)(3) + (3/5)(5) |

    . . . = . | 2 + 0 + 3/5 . -2/5 + 0 + 3 |

    . . . = . | 13/5 . 13/5 |


    | 13/5 . 13/5| * | 0 | . = . (13/5)(0) + (13/5)(1) . = . 13/5
    . . . . . . . . . . . . | 1 |

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  3. #3
    Junior Member
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    Thanks for showing me the correct way of multiplying matrices.
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