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Math Help - Please Help Matrix Equation Problems Due 2morrow!!!

  1. #1
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    Please Help Matrix Equation Problems Due 2morrow!!!

    Aside from the fact that im a complete retard when it comes to math my teacher is also horrendous....Any help with these problems would be much appreciated!..

    if A=[3 6] [-1 5]
    [1 2] and B= [4 3] then find A-2B


    Find the matrix....[1 2] [4 1 1]
    [-1 3] [1 2 3]
    [1 1]
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    Quote Originally Posted by JP101 View Post
    Aside from the fact that im a complete retard when it comes to math my teacher is also horrendous....Any help with these problems would be much appreciated!..

    if A=[3 6] [-1 5]
    [1 2] and B= [4 3] then find A-2B


    Find the matrix....[1 2] [4 1 1]
    [-1 3] [1 2 3]
    [1 1]
    For the first one, the components for 2B are just 2[b_{ij}] so the the components of C = A - 2B are just c_{ij} = a_{ij} - 2b_{ij}.

    For the second one I presume you know how to multiply matrices? If we have C = AB then c_{ik} = \sum_j a_{ij}b_{jk}.

    Try those formulas out and see what you get. Come back if you are still confused.

    -Dan
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