Question

I don’t know how to begin this problem

Answer 1

$\bf x- \begin{bmatrix} 2&-8\\-4&2 \end{bmatrix}= \begin{bmatrix} 4&-6\\2&-8 \end{bmatrix}\implies x= \begin{bmatrix} 2&-8\\-4&2 \end{bmatrix}+ \begin{bmatrix} 4&-6\\2&-8 \end{bmatrix} \\\\\\ x= \begin{bmatrix} 2+4&\qquad -8-6\\ -4+2&\qquad 2-8 \end{bmatrix}\implies x= \begin{bmatrix} 6&-14\\-2&-6 \end{bmatrix}$