If A is a square matrix of order 2 and |A| = −2, then ||A|A| is equal to:
If A is a square matrix of order 2 and |A| = −2, then ||A|A| is equal to:
- A. −8
- B. 8
- C. −4
- D. 4
Answer: A) −8
Explanation: |A| = −2. The matrix |A|A = −2A. Its determinant is |−2A| = (−2)²|A| = 4 × (−2) = −8.
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