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Multiply the Matrices to get the product ​

Multiply the Matrices to get the product ​-example-1

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Notice that A is simply -1 times the identity matrix. So


AB = -1 * IB = -1 * B = -B

so that


AB = \begin{bmatrix}-1&-2&-2&-4&-4&-5\\-3&-2&-4&-2&-4&-3\end{bmatrix}

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