Question

Multiply the Matrices to get the product ​

Answer 1

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

$AB = -1 \times IB = -1 \times B = -B$

so that

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