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Question
If A is a square matrix of order 3 with |A| = 4 , then the write the value of |-2A| .
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Solution
Since, order of the matrix, n = 3
|A| = 4
|-2A| = (-2)n |A|
|-2A| = (-2)3 x 4
|2A| = - 32
Therefore, the value of |- 2A| is -32.
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