1.

If A is a square matrix such that A2 = I, then (A − I)3 + (A + I)3 − 7A is equal to(a) A(b) I − A(c) I + A(d) 3A

Answer» If A is a square matrix such that A2 = I, then (A − I)3 + (A + I)3 − 7A is equal to



(a) A

(b) I − A

(c) I + A

(d) 3A


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