Please solve the following equation using MATLAB , i'm having a hard time undersanding it.(Please Paste the codes bellow all steps)

Problem 2 Consider the causal non-linear discrete-time system characterized by the following difference equation: If we use as input x[n] to this system (algorithm) a step function of amplitude A (i.e. x[n]-A u[n]), then y[n] will converge after several iterations to the square root of A Write a MATLAB program that implements the above recursion to compute the square root of 8 49, 16 and 3. How many iterations does it take to converge to the true value starting at y-1]-0.2