3. 115 marks) For the following question a simple 'yeso' answer is not sufficient As a hint you may want to consider the matrices-120 75 1 [49-30 and 40 -24 -192 120 80-49 ?0 0 (a) lfxis a number, then x2 :0 means x = 0. But if x is a matrix such that x2 ? , can we concludethat-B o)? (b) lf x is a number, then x2-1 means x 1 . But if x is a matrix such that x- , can 0 1 we conclude that x| 0 1