Kizspy | Question: 61
(Choose 1 answer)
(See picture)
A. (iv)
B. None of these
C. (i)
D. (ii)
E. (iii)
Let A be a square matrix that satisfies A³ = 21,where I is an identity matrix of the same size.
Choose the correct statement:
(i) A is not invertible
(ii) A is invertible and A¹ = (1/2)A2
(iii) A is invertible and A¹ = A2
(iv) A is invertible and A¯¹ = 2A2
