1. Consider the function f(x)-2.75 +18z2 -21 12 a) Plot the graph of f() in MATLAB and find all the roots of the function f(x) graphically. b) Compute by hand the first root of the function with the bisection method, on the interval c) How many iterations on the interval (-1, 0 are needed with the bisection method to obtain d) Find all the roots applying MATLAB's built-in procedure. Include the MATLAB code Provide the code and the plot you obtained. (-1; 0) for a stopping criterion of 1%. the true error of the first root less than 10-8? used and the output obtained