# need help with his one question

**Question description**

Consider the equation below.

^{3}+ 3x

^{2}− 72x

*f*is increasing. (Enter your answer in interval notation.)

Find the interval on which

*f*is decreasing. (Enter your answer in interval notation.)

(b) Find the local minimum and maximum values of

*f*.

local minimum | |

local maximum |

(c) Find the inflection point.

(x, y) =

Find the interval on which

*f*is concave up. (Enter your answer in interval notation.)

Find the interval on which

*f*is concave down. (

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