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Find the value \( \left|\begin{array}{cc}5 & 3 \\ -7 & -4\end{array}\right| \)

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Find the value \( \left|\begin{array}{cc}5 & 3 \\ -7 & -4\end{array}\right| \)

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\(\begin{vmatrix}5&3\\-7&-4\end{vmatrix} = 5 \times (-4) -3 \times (-7)\)

\(= -20 + 21\)

\(= 1\)

Hence, the value is 1.

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