Question:
Evaluate the determinants in Exercises 1 and 2.
$\left|\begin{array}{cc}2 & 4 \\ -5 & -1\end{array}\right|$
Solution:
$\left|\begin{array}{cc}2 & 4 \\ -5 & -1\end{array}\right|=2(-1)-4(-5)=-2+20=18$
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