Answer
Choice A
Work Step by Step
*Adding the corresponding elements of the matrices, the given matrix expression, $
\begin{bmatrix}
5 & 7 & 3
\\
-1 & 0 & -4
\end{bmatrix}
+
\begin{bmatrix}
-7 & 4 & 2
\\
1 & -2 & -3
\end{bmatrix}
,$ simplifies to
\begin{align*}
&
\begin{bmatrix}
5+(-7) & 7+4 & 3+2
\\
-1+1 & 0+(-2) & -4+(-3)
\end{bmatrix}
\\\\&=
\begin{bmatrix}
-2 & 11 & 5
\\
0 & -2 & -7
\end{bmatrix}
.\end{align*}
Hence, Choice A.
