Unit 3, Day 3

Agenda

1. Number talk: Always, Sometimes, Never — second derivative claims
2. Random groups — from $f$ to $f^{\prime }$ to $f^{\prime \prime }$, all three graphs stacked on the same axes
3. Consolidate: concavity, inflection, and why the second derivative test works

Things to do before our next class

• Journal: what an inflection point looks like on all three graphs.