Question 4: July 2020 4 2 1 3 a) Find AB' -2C if the matrices A = 3 1 2 B = and C = 3 0 4 1 3 2 1 -2 3 b) Find the inverse of the matrix M = -1 3 0 using Gauss-Jordan elimination. 2 -5 4 Verify the answer. Question 5: June 2019 3 0 a) If A = 2 -1 4 5 0 i) Find the rank of A . ii) Determine whether AA is symmetric. 1 0 4 b) Use Gauss-Jordan elimination to show that A = -2 -1 -8 is non-singular. 0