Evaluate | rr 2 & 4 -1 & 2 | - Vidyadip

Question

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

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Answer

We have $\left|\begin{array}{cc} {2} & {4} \\ {-1} & {2} \end{array}\right|$ = 2 (2) – 4(–1) = 4 + 4 = 8.

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