$$[\begin{matrix}5-1\\ -3&4\end{matrix}][\begin{matrix}4&1\\ 3&5\end{matrix}]$$
$\left(\begin{matrix}16&4\\0&17\end{matrix}\right)$
$$\left(\begin{matrix}4&0\\-3&4\end{matrix}\right)\left(\begin{matrix}4&1\\3&5\end{matrix}\right)$$
$$\left(\begin{matrix}4\times 4&\\&\end{matrix}\right)$$
$$\left(\begin{matrix}4\times 4&4\\-3\times 4+4\times 3&-3+4\times 5\end{matrix}\right)$$
$$\left(\begin{matrix}16&4\\-12+12&-3+20\end{matrix}\right)$$
$$\left(\begin{matrix}16&4\\0&17\end{matrix}\right)$$
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$272$
