### Home > CALC > Chapter 5 > Lesson 5.1.3 > Problem 5-30

5-30.

CANDIDATES for points of inflection can be found where *f* ''(*x*) = 0 and where *f* ''(*x*) = DNE. You must check both.

Notice that there is not a concavity change at the cusp.

5-30.

CANDIDATES for points of inflection can be found where *f* ''(*x*) = 0 and where *f* ''(*x*) = DNE. You must check both.

Notice that there is not a concavity change at the cusp.