Question

2 IF A is a square matrix and A2 + 8A-1 = 0, then A is invertible.
a) True b) False
c)Non​

Answer 1

Answer:

A2=I

A.A=I

Post multiplying by A−1 both the sides

A.(AA−1)=I.A−1

AI=IA−1

Hence, A −1=A

a) True