MCQ
Find the value of
$\left|\begin{array}{cc}5 & 3 \\ -7 & -4\end{array}\right|$.
$\left|\begin{array}{cc}5 & 3 \\ -7 & -4\end{array}\right|$.
- A-1
- B-41
- C41
- D1
✓
Answer
$D =\left[\begin{array}{cc}
5 & 3 \\
-7 & -4
\end{array}\right]=(5 \times-4)-(3 \times-7)=-20+21=1$
Hence, option D is correct.
5 & 3 \\
-7 & -4
\end{array}\right]=(5 \times-4)-(3 \times-7)=-20+21=1$
Hence, option D is correct.
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