help with built in function

MATLAB's built-in math functions are useful for solving equations. The following is the equation of a third order polynomial. y = 3x? 0.5x? - 2x a) Define an array x from -0.8 to 1 with increments of 0.1. Calculate the values of y for all x and assign the results to array y. ** Don't forget since x is an array you need to use.* and .A when creating y ** b) Find the maximum and minimum values of array y. Call these values M1 and M2, respectively. c) Create variables M1_Frac and M2_Frac and make them the fractions of M1 and M2, respectively