use MATLAB please.

One method for finding a root of a function is the bisection method. Here is a nice writeup on the bisection method: http://www.mathwarehouse.com/calculus/continuitv/continuitv-bisection-method.php Write a function bisect() that finds the root of a polynomial ax^3 + bx^2 + cx + d over an interval [A, B]. The function takes as input the coefficients a, b, c, d, and the interval limits A and B. The function returns as output the value of the root over the interval [A, B], if it exists. The function also returns as output a message (flag) that informs the user if no roots exist over the interval [A, B]. It should be clear that you cannot use any of MATLAB's built-in root finding functions to do this problem. Use the bisection method. a = -1: b = 1: c = -1: d = 10: A = 0: B = 5: [root, flag] = bisect(a, b, c, d, AB)