Let $f(x)=\frac{x^4}{4}+7 x^3+72 x^2$.
AFind the inflection points. Enter your answers as ordered pairs.
BIdentify interval(s) where the graph of $f$ is concave up. Write NONE if there is no answer.
CIdentify interval(s) where the graph of $f$ is concave down. Write NONE if there is no answer.
AFind the inflection points. Enter your answers as ordered pairs.
BIdentify interval(s) where the graph of $f$ is concave up. Write NONE if there is no answer.
CIdentify interval(s) where the graph of $f$ is concave down. Write NONE if there is no answer.