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Math Help - inversion of a matrix

  1. #1
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    inversion of a matrix

    I need to find the inverse of the following matrix. Could somone tell me if I did this correctly? Thanks, Frostking

    1 1 ! 1 0
    2 3 ! 0 1
    First I inverted the two equations and then I multiplied equation one by - 1/2 and added it to equation 2 and got

    - 1 -3/2 ! 0 - 1/2
    0 -3/2 ! 1 -1/2

    next I multiplied equation 1 by - 1 and added equation 2 to equation 1 and last I multiplied equation 2 by -2/3
    1 0 ! 1 0
    0 1 ! -2/3 1/3
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  2. #2
    VkL
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    Did you find the minors? and then the co factors? and the determinant? and the adj ?

    You need to calculate those 4 before you can find the inverse.

    B/c the inverse of a matrix A = (1 / Det|A|) * Adj(A)
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