Let . On which open interval is…

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

Problem

Let f(x)=x3−6x2+9x+4f(x)=x^{3}-6x^{2}+9x+4. On which open interval is ff decreasing? (a) (−∞,1)(-\infty,1) (b) (1,3)(1,3) (c) (1,∞)(1,\infty) (d) (−∞,2)(-\infty,2)

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