$$\left[ \begin{array} { l l } { - 5 } & { 2 } \\ { 3 } & { - 1 } \end{array} \right]$$
$-1$
$$det(\left(\begin{matrix}-5&2\\3&-1\end{matrix}\right))$$
$$-5\left(-1\right)-2\times 3$$
$$5-2\times 3$$
$$5-6$$
$$-1$$
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$\left(\begin{matrix}-5&2\\3&-1\end{matrix}\right)$
