Answer
$-\begin{bmatrix}
-28.2& 30.1 & -20.9\\
7.9& 27.9 & -37\\
-8 & -36.4 & 7.8
\end{bmatrix}$
Work Step by Step
$-3\begin{bmatrix}
4.2 & -7.3 & 0.7\\
2.7 & -9.3 & 11.8\\
3.6 & 8.2 & -4.8
\end{bmatrix}$ $-(2)\begin{bmatrix}
7.8 & -4.1 & 9.4\\
-8& 0 & 0.8\\
-1.4 & 5.9 & 3.3
\end{bmatrix}$
$=\begin{bmatrix}
4.2(-3) & -7.3(-3) & 0.7(-3)\\
2.7(-3) & 9.3(-3) & 11.8(-3)\\
3.6(-3) & 8.2(-3) & -4.8(-3)
\end{bmatrix}$$-\begin{bmatrix}
7.8(2) & -4.1(2) & 9.4(2)\\
-8(2)& 0(2) & 0.8(2)\\
-1.4(2) & 5.9(2) & 3.3(2)
\end{bmatrix}$
$=\begin{bmatrix}
-12.6 & 21.9 & -2.1\\
-8.1 & 27.9 & -35.4\\
-10.8 & -24.6 & 14.4
\end{bmatrix}$$-\begin{bmatrix}
15.6 & -8.2 & 18.8\\
-16& 0 & 1.6\\
-2.8 & 11.8 & 6.6
\end{bmatrix}$
$=-\begin{bmatrix}
-28.2& 30.1 & -20.9\\
7.9& 27.9 & -37\\
-8 & -36.4 & 7.8
\end{bmatrix}$
