Compute the product. This exercise should be done two ways: by hand and by using technology where possible. (If an answer is undefined, enter UNDEFINED in any cell of the matrix.) \begin{bmatrix} 1 & 1 & 1 \ -1 & 0 & 2 \ -1 & 0 & -2 \ 1 & -1 & 1 \end{bmatrix} \begin{bmatrix} -9 & 0 \ 2 & 4 \ -2 & 1 \end{bmatrix}
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