Electronic Proceedings of the Twentyfifth Annual International Conference on Technology in Collegiate MathematicsBoston, Massachusetts, March 2124, 2013Paper C045
This is an electronic reprint, reproduced by permission of Pearson Education Inc. Originally appeared in the Proceedings of the Twentyfifth Annual International Conference on Technology in Collegiate Mathematics, ISBN10: 0133866726, Copyright (C) 2014 by Pearson Education, Inc. 
Using the TI89 to Delve Deeper Into the Graphs of Polynomial Functions 
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With the aid of the TI89, we consider the relationship between the general cubic and location of extrema and inflection points, the connection between a cubic having distinct real roots and the abscissa of the inflection point, the link between multiple roots and the derivative, and the abscissa of the vertex of a quadratic having distinct real roots.
Keyword(s): college algebra, TI89