Problem:
Multiply
$\left(
\begin{array}{ccc}
 2 & 1 & 2 \\
 1 & 2 & 0 \\
 1 & -2 & -3 \\
 0 & -2 & 0 \\
\end{array}
\right)$ and
$\left(
\begin{array}{cc}
 -1 & -2 \\
 -1 & 1 \\
 -2 & 2 \\
\end{array}
\right)$.
Answer:
$\left(
\begin{array}{cc}
 -7 & 1 \\
 -3 & 0 \\
 7 & -10 \\
 2 & -2 \\
\end{array}
\right)$
{'source': 'AMPS', 'file': 'amps/mathematica/linear_algebra/multiply/37147.txt'}