= ] a Lo -a Q-3: [6+4 marks] [1 0 2 a) Let A = 2 0 . Find all values of a for which the matrix A has inverse. 2 Find A-1 (in terms of a) for the cases where it exists. [ 2 1 2 3 6 2 4 8 b) Let A By transforming A to upper triangular form 1 -1 0 4 LO 1 -3 -4 find |A. =