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:A
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