Write a user-defined MATLAB function for the following math function: y(x) = 0.2x^4 + e^(-0.5x) * x^3 + 7x^2 The input to the function is x and the output is y. Write the function such that x can be a vector (use element-by-element operations). (a) Use the function to calculate y (2.5), and y (3). (b) Use the function to make a plot of the function y(x) for 3 x 4.