Practice question
Question
If A is a 2 × 2 matrix and |A| = 5, what is |5A| ? (| | denotes determinant)
Explanation
Let's break it down: formula |kA|=kⁿ|A|, n=order. Here n=2, k=5, |A|=5. So |5A|=5²×5=25×5=125. Full calculation.
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