Let f be a function having derivatives for all orders of all real numbers. The Third degree Taylor polynomial for f about x=-2 is given by
P(x)=9-4(x+2)+5/3(x+2)²-20/7(x+)³. The fourth derivative of f satisfies the inequality that |f⁴x|≤25 for all x in the interval [-2,0-1.6)