determinants of matrices?

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  • 1 decade ago
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    what about it? how to find it?

    Let's say this is your matrix:

    [a b]

    c d

    now to find the determinant, you just need to multiply "a" with "d" and "c" with "b" then subtract them.

    to find the 3 by 3 matrix:

    [a b c]

    d e f

    g h i

    1. add the first two columns of your matrix next to the last column.

    [a b c a b]

    d e f d e

    g h i g h

    2. then multiply the main diagonals and add

    aei + bfg + cdh

    3. multiply the opposite diagonals and add

    gec + hfa + idb

    4. subtract the two answers

    5. that's your determinant

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  • 1 decade ago

    what about them?

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