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Math Help - help me(Matrices&Determinants)

  1. #1
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    help me(Matrices&Determinants)

    need help on this particular question... with EXPL too . i have a exam tommorrow morning and this urgent. Thanks for the help guys...

    Given the following determinant

    | 6 2 |
    | -1 5 |

    Find the minor and cofactor of element a21.
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  2. #2
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    Quote Originally Posted by watsonmath View Post
    need help on this particular question... with EXPL too . i have a exam tommorrow morning and this urgent. Thanks for the help guys...

    Given the following determinant

    | 6 2 |
    | -1 5 |

    Find the minor and cofactor of element a21.
    Okay,
    a21 is located at,
    The second row 1 coloumn.
    The minor is canceling all rows and colomns along it, which is in this case.
    |-1|=-1
    The cofactor is,
    (-1)^(2+1)*minor
    Thus,
    (-1)(-1)=1
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