inverting the matrixes

Problem 1. (10 points) 1. Invert the following matrices (if possible): 2 0 A = 3 A- = 4 0 5 6 01 0 0 0 0 0 0 2 0 0 0 B = 3 0 0 0 0 0 B-1 = 0 0 0 0 4 0 0 0 0 50 0 0 0 0 0 0 6 10 20 C = 0 0 0 3 C-1 0 40 0 5 0 60 2. The principal square root of a positive semi-definite matrix M is defined to be the positive semi-definite matrix N for which N2 = M. It is denoted M1/2. For each of the following matrices, first decide if it is positive semi-definite. If so, then compute its principal square root. Positive semi-definite? 4 - ( 9 3 ) Yes No A1/2 = B = 3 2 2 Yes No B1/2 =