### Home > APCALC > Chapter 8 > Lesson 8.2.2 > Problem 8-85

8-85.

**Multiple Choice: ** changes concavity at

Concavity change might (or might not) happen where . Remember, you must confirm that concavity CHANGES at that candidate by detecting a sign change in the second derivative before and after the candidate, or by confirming that third derivative at the candidate is not equal to