Using the initial guesses of x1 = -2 and Xu = 4, calculate the maximum value for this function. f(x) = 2x1.75x + 1.1x3 - 0.25x4 (a) Determine X1 Xu (b) Calculate d = (c) Calculate X1 X2 (d) Determine f(x1) f(x2) (e) Sketch for X1, X2, X1, and Xu and their f(x) values (f) From the sketch in (e), determine Xopt = (g) Calculate error, &a= (h) Determine x and xu for the next iteration X1 Xu f(x1) f(xu) (i) Continue calculation to complete the following table Xu X1 -2 4 d X1 X2 f(x1) f(xu) f(x1) f(x2) Xopt a (%)