Question:
If $A$ is a $2 \times 2$ matrix such that $|A| \neq 0$ and $|A|=5$, write the value of $|4 A|$.
Solution:
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If $A$ is a $2 \times 2$ matrix such that $|A| \neq 0$ and $|A|=5$, write the value of $|4 A|$.