(a) Determine the roots of A? (x) = - 12 - 21x + 18x2 -2.75x3 graphically. In addition, determine the first root of the function with
(b) Bisection, and
(c) False position. For (b) and (c) use initial guesses of xt = - 1 and xu = 0, and a stopping criterion of 1 %