Suppose that [math]

(A) Find all critical values of [math]. If there are no critical values, enter None. If there are more than one, enter them separated by commas.

Critical value(s) =

(B) Use interval notation to indicate where [math] is concave up.

Concave up:

(C) Use interval notation to indicate where [math] is concave down.

Concave down:


(D) Find all inflection points of [math]. If there are no inflection points, enter None. If there are more than one, enter them separated by commas.
Inflection point(s) at [math] =