Two 2 x 2 matrices, A and B, whose product is the multiplicative identity matrix are said to be multiplicative inverses. That is, if A x B = B x A = I, then A and B are multiplicative inverses. In parts (a) and (b) below, show that matrices A and B are multiplicative inverses.

(a)

(b)

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1 27 5 -2 A = -2 B = 2 5 3 [7 A = 1 -3 B = -2 7.