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Math Help - Matrices help appreciated

  1. #1
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    Smile Matrices help appreciated

    Expand the matrix:

    1 5 1
    2 3 4
    2 12 4


    a) by the third row

    b) by the second column

    I'm not sure how to do this. Help would be greatly appreciated!
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  2. #2
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    Quote Originally Posted by brumby_3 View Post
    Expand the matrix:

    1 5 1
    2 3 4
    2 12 4

    a) by the third row

    b) by the second column

    I'm not sure how to do this. Help would be greatly appreciated!
    What do your notes and/or textbook say? Where are you stuck. Do you understand what the question is asking?

    Minors and Cofactors: Expanding Along a Row
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