Question
Find the value of $\left|\begin{array}{cc}5 & 2 \\ 0 & -1\end{array}\right|$
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Answer
$\begin{aligned} & \left|\begin{array}{cc}5 & 2 \\ 0 & -1\end{array}\right|=5 \times(-1)-2 \times 0 \\ & =-5-0 \\ & =-5\end{aligned}$
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