1. Employ the the following methods the find the maximum or minimum of f(x) x5+ 4x4-0.8x3 2x2 +0.5:x a) Use a Matlab program to show the function has a minimum or maximum for some value b) Employ the Golded-section search method to find the minimum or maximum value with c) Employ the parabolic interpolation method to find the minimum value with using your d) of x in the range -5 sx s 5 using your own initial guess. ( 1%) own initial guess. (x,--2, x,--1, x,-1, iterations = 5) Develop M-file of fminbnd for above problems and compare your results