Evaluate | cc 2 & 4 -5 & -1 | - Vidyadip

Question

Evaluate $\left|\begin{array}{cc}2 & 4 \\ -5 & -1\end{array}\right|$

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Answer

$\left| {\begin{array}{*{20}{c}} 2&4 \\ { - 5}&{ - 1} \end{array}} \right| $ = 2(-1) - 4(-5) = -2 + 20 = 18

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