Consider the following in respect of matrices A and B of same order:
1) A2 – B2 = (A + B) (A – B)
2) (A – I) (I + A) = O ⇔ A2 = I
Where I is the identity matrix and O is the null matrix.
Which of the above is/are correct?1
1 only
2
2 only
3
Both 1 and 2
4
Neither 1 nor 2