Which one of the following equations is a correct identity for...

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Which one of the following equations is a correct identity for arbitrary 3 × 3 real matrices P, Q and R?

A. P(Q + R) = PQ + RP

B. (P - Q)² = P² - 2PQ + Q²

C. det (P + Q) = det P + det Q

D. (P + Q)² = P² + PQ + QP + Q²

Answer: Option D

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