6.19 Use Newton-Raphson to find a solution to the polynomial equation f(x) = y where

y = 0 and f(x) = x³ +9x² + 2x - 48. Start with x(0) = 1 and continue until (6.2.2) is

satisfied with = 0.001.

6.20 Repeat 6.19 using x(0) = -1.