Consider the function $f(x) = 2x^3 + 2x^2 + 1$.
Find the largest open intervals on which the function is concave up or concave down. If there is more than one interval,
intervals from left to right as they appear on the real line. Enter INF for $\infty$ and -INF for $-\infty$. If there are extra blank
Concave up: $(-1/3, INF)$, $(NONE, NONE)$
You are correct.
Your receipt no. is 388-465447
Concave down: $(-INF, -1/3)$, $(NONE, NONE)$
You are correct.
Your receipt no. is 166-3008
Previous Tries
Find all the inflection points. Enter your answer in the format of $(x, y)$ and enter the inflection point with the smaller x
are no inflection points, enter NONE.
Inflection point: $(-1/3, 31/27)$
You are correct.
Inflection point: $(NONE, NONE)$
You are correct.
Your receipt no. is 366-7060
Previous Tries
Find the largest open intervals on which the function is both concave up and increasing. If there is more than one interv
intervals from left to right as they appear on the real line. Enter INF for $\infty$ and -INF for $-\infty$. If there are extra blanks
Concave up and increasing: (