Question: Explain why each of the following algebraic rules will not work in general when the real numbers a and b are replaced by n

Explain why each of the following algebraic rules will not work in general when the real numbers a and b are replaced by n × n matrices A and B.
(a) (a + b)2 = a2 + 2ab + b2
(b) (a + b)(a - b) = a2 - b2

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