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Determinant

Find the valu...

Question

Find the value of determinant $∣ ∣ ∣ \begin{matrix} 2 & 4 - 5 & - 1 \end{matrix} ∣ ∣ ∣$ .

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Solution

$∣ ∣ ∣ \begin{matrix} 2 & 4 - 5 & - 1 \end{matrix} ∣ ∣ ∣$
$= 2 (- 1) - 4 (- 5) = - 2 + 20 = 18$

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