Find the intervals on which f is incereasing and decrasing. Superimpose the grap

Question

Find the intervals on which f is incereasing and decrasing. Superimpose the graphs of f and f' to verify your work. f(x)=x^3 + 6x. Select one of the choices below filling in blank spaces. A) The function is increasing on ____ and decreasing on ____. (Type answers in interval notation using comma to separate answers as needed). B) The function is decreasing on ____ . The function is never increasing. (Type answers in interval notation using comma to separate answers as needed). C) The function is increasing on ____. The function is never decreasing. (Type answers in interval notation using comma to separate answers as needed). D) The function is never increasing nor decreasing.

Explanation / Answer

D) The function is never increasing nor decreasing.

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