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Question

If A and B are square matrices of order 3 and |A| = 5, |B| = 5, then |3AB| = ____________.

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Solution

Given:
A and B are square matrices of order 3
|A| = 5
|B| = 5


Now,3AB=3AB AB=AB, if they are square matrices of same order =3A×5 B=5 =33A×5 Order of A is 3×3 =135A =135×5 A=5 =675

Hence, |3AB| = 675.

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