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Math Help - [SOLVED] Matrix Operations

  1. #1
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    [SOLVED] Matrix Operations

    I need some help with this. There's no answer in the back of the book and I computed the inverse to check my answer and I keep getting it wrong.



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  2. #2
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    "2 times row one of A^{-1} minus row two of A^{-1} plus 3 times row 3 of A^{-1}" is simply \begin{bmatrix}2 & -1 & 3\end{bmatrix}A^{-1}. But that is the second row of A. Multiplying the second row of A by A^{-1} gives the second row of the identity matrix which is \begin{bmatrix}0 & 1 & 0\end{bmatrix}.
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  3. #3
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    ah ok got it
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