Question: 4. Let A = 7 (21) and B = = (3 5). Compute the following as efficiently as possible by using any of the

4. Let A = 7 (21) and B = = (3 5). Compute the following as efficiently as possible by using any of the Laws of Matrix Algebra: a. AB b. A+ B C. A + ABBA + B d. BA- -1 e. A + AB

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