$$\left[ \begin{array} { l l } { 2 } & { 4 } \\ { - 2 } & { 1 } \end{array} \right]$$
$10$
$$det(\left(\begin{matrix}2&4\\-2&1\end{matrix}\right))$$
$$2-4\left(-2\right)$$
$$2-\left(-8\right)$$
$$10$$
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$\left(\begin{matrix}2&4\\-2&1\end{matrix}\right)$
