ed Q1) If A.B. I are square matrices of size 3x3 with tr(AB) = 5, find tr(AB+ 4BA+7) (7 MARKS) Q2) Is the matrix 3AB* +3B A hermitian?(show your work).(7 MARKS) Q3) Is A = unitary? nilpotent? idempotent? positive semidefi- nite?(show all of your work)(8 MARKS) out of [:)]