$$\left[ \begin{array} { l l } { - 2 } & { 4 } \\ { - 1 } & { 9 } \end{array} \right]$$
$-14$
$$det(\left(\begin{matrix}-2&4\\-1&9\end{matrix}\right))$$
$$-2\times 9-4\left(-1\right)$$
$$-18-4\left(-1\right)$$
$$-18-\left(-4\right)$$
$$-14$$
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$\left(\begin{matrix}-2&4\\-1&9\end{matrix}\right)$
