Question

Which of the following is incorrect
JA) A2-B2 = (A+B)(A-B)
(b) (A')' = A
(c)(AB)" = A"B" where A, B commute.
(d) (A-1)(1+A)= 0 = AP=1.​

Answer 1

Answer:

(d) is my correct answer

Answer 2

Answer:

c is my correct answer I hope this help you