Answer
$X=\left[\begin{array}{ll}
7 & 27\\
-8 & 36\\
-17 & -4
\end{array}\right]$
Work Step by Step
$ B-X=4A\qquad$ ... add $X$ to both sides
$B-X+X=4A+X$
$ B=X+4A\qquad$ ... subtract $4A$ from both sides
$B-4A=X$
$X=B-4A$
$X=\left[\begin{array}{ll}
-5 & -1\\
0 & 0\\
3 & -4
\end{array}\right]-4\cdot\left[\begin{array}{ll}
-3 & -7\\
2 & -9\\
5 & 0
\end{array}\right]$
$X=\left[\begin{array}{ll}
-5-4(-3) & -1-4(-7)\\
0-4(2) & 0-4(-9)\\
3-4(5) & -4-4(0)
\end{array}\right]$
$X=\left[\begin{array}{ll}
7 & 27\\
-8 & 36\\
-17 & -4
\end{array}\right]$
