0 2 -1 0 ... -1 2 -1 0 -1 0 -1 0 0 0 2 A = 2 0 : 0 0 2 0 0 : -1 2 0 -1 b= [0.1 0.2 ... 1.9 2.0]? R20 Solve Ax=b by using Richardson method, in MATLAB. . Optimal A parameter is 0,5. Given initial guess is x) = [1 1 ... 11]" R20 The iteration number is 25. A is a 20x20 Toeplitz matrix