If A is square matrix such that A2=I, then A−1 is equal to
Answer : Option AExplaination / Solution: If A amd B are two square matrices of same order and the product AB= I, the matrix B is called inverse of matrix A.Therefore ,ifA2= I, then matrix A is the inverse of itself.
If A and B are square matrices of the same order, then(A+B)2=A2+2AB+B2 implies
Answer : Option CExplaination / Solution:
If A and B are square matrices of same order , then , product of the matrices is not commutative.Therefore , the given result is true only when AB = BA.