1. The problem statement, all variables and given/known data Let [tex]A, B \epsilon R[/tex]n x n. 2. Relevant equations A. Show that if AB = BA, then (A + B)2 = A2 + 2AB + B2. B. Give an example of 2 x 2 matrices A and B such that (A + B)2 [tex]\neq[/tex] A2 + 2AB + B2. 3. The attempt at a solution I have tried to find such a matrices A and B such that the requirements applies. Perhaps, this allows to show the equations.