5. Complete parts (a) and (b) 6 N 1 1 -2 8 -2 -4 a. Verify that A = is idempotent 11 -5 -2 6 1 1 -4 1 2 3 17 1 1 b. For the matrices A = -1 and B = 0 1 , verify that trace(AB) = trace(BA) 2 2 1