CUET · MATHS · PYQ PAPER 2023
If A is a square matrix of order 3 and \(|A| = -2\) then, \(|-2A^{-1}|\) is:
- A -4
- B 4
- C 8
- D 2
Answer & Solution
Correct Answer
(B) 4
Step-by-step Solution
Detailed explanation
\(|-2A^{-1}| = (-2)^3 |A^{-1}|\) \(|-2A^{-1}| = (-2)^3 \frac{1}{|A|} = (-8) \frac{1}{-2}\) \(|-2A^{-1}| = 4\)
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