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Home > CALC > Chapter 7 > Lesson 7.4.4 > Problem 7-209

7-209.

Where is f '(x) positive?

Solve f ''(x) > 0 and f ''(x) < 0.

An inflection point occurs where f ''(x) undergoes a sign change.
Sometimes that happens where f ''(x) = 0 and sometimes where f ''(x) = DNE.