A^2= [1 0 0] [0 1 0] [6 4 1] A^3= [1 0 0] [0 1 0] [9 6 1] B^2= [1 0 0] [0 4 0] [0 0 9] B^3= [ 1 0 0] [ 0 8 0] [ 0 0 27]