Answer
$\begin{bmatrix}
0 & 0
\\
0 & 0
\end{bmatrix}$
Work Step by Step
Adding/subtracting the corresponding elements in the given matrix expression, $ \begin{bmatrix}
6 & -3
\\
-7 & 2
\end{bmatrix}
+
\begin{bmatrix}
-6 & 3
\\
7 & -2
\end{bmatrix}
,$ results to
\begin{align*}
&
\begin{bmatrix}
6+(-6) & -3+3
\\
-7+7 & 2+(-2)
\end{bmatrix}
\\\\&=
\begin{bmatrix}
0 & 0
\\
0 & 0
\end{bmatrix}
.\end{align*}
Hence, the given expression simplifies to $
\begin{bmatrix}
0 & 0
\\
0 & 0
\end{bmatrix}
$.
