Question

If A and B are square matrices of the same order then (A + B)(A – B) = ? 

A. (A² - B²) 

B. A² + AB – BA – B² 

C. A² – AB + BA – B² 

D. none of these

Answer 1

Since A and B are square matrices of same order. 

(A + B)(A - B) = A² –AB + BA – B