Consider the function

MATHEMATICS · Single correct · AP · Calculus AB · Analytical Applications of Differentiation · Analytical Applications of Differentiation

Problem

f(x)=x^{3}-6x^{2}+9x+1

. On which interval is

f

concave up? (a)

(-\infty,2)

(b)

(-\infty,1)\cup(3,\infty)

(c)

(2,\infty)

(d)

(-\infty,\infty)