Learners investigate the slope of a cubic function. They find the tangent line of the cubic function at point P, and discuss the relationship between point P and point Q, the point the tangent line intersects the cubic function. They then find the ratios of the areas of the two sections divided by the tangent line.

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##### Included Materials - Join to Access

- Interesting Properties of Cubic Functions to Discover Graphically or Numerically and then Prove with the Power of the TI-89
- Getting Started with the TI-89
- Getting Started with the TI-89 Titanium
- Introduction to the TI-89 for Beginners