Answer
\begin{bmatrix}
21 & -8 \\
74 & -50
\end{bmatrix}
Work Step by Step
$$
\begin{bmatrix}
1 & 3 & 0 \\
2 & 12 & -4
\end{bmatrix}
\times
\begin{bmatrix}
9 & 1 \\
4 & -3 \\
-2 & 4
\end{bmatrix}
=
\begin{bmatrix}
(1\times9)+(3\times4)+(0\times(-2)) & (1\times1)+(3\times(-3))+(0\times4) \\
(2\times9)+(12\times4)+(-4\times(-2)) & (2\times1)+(12\times(-3))+(-4\times4)
\end{bmatrix}
=
\begin{bmatrix}
21 & -8 \\
74 & -50
\end{bmatrix}
$$
