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Math Help - Matrices - please help

  1. #1
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    Matrices - please help



    Oh I forgot to mention the answer says that it is

    (14..25)
    (5....9 )
    ^ sorry if that doesn't look right
    it's supposed to be a matrice
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  2. #2
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    Quote Originally Posted by positiveion View Post


    Oh I forgot to mention the answer says that it is

    (14..25)
    (5....9 )
    ^ sorry if that doesn't look right
    it's supposed to be a matrice
    You're meant to realise that the result of AB tells you that B^{-1} = A ....

    Then BC = A \Rightarrow B^{-1} B C = B^{-1} A \Rightarrow C = B^{-1} A = A^2.
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  3. #3
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    wait, why does that equal A^2
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  4. #4
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    Quote Originally Posted by positiveion View Post
    wait, why does that equal A^2
    You're meant to join the dots. Substitute B^{-1} = A.
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