1. The problem statement, all variables and given/known data Prove that if the matrices A and B commute (AB=BA) than the equations: [tex]a) (A+B)^2=A^2+2AB+B^2 ; b) (A+B)^2=A^3+3A^2B+3AB^2+B^3[/tex] are valid. 2. Relevant equations 3. The attempt at a solution How will I start solving this task? Should I chose two commute matrices ? How will I know what matrices to choose?