T³ Deutschland Materialien

The Discriminant

The Discriminant

Andy Kemp


Schlagwörter Quadratic

Explore the role of the discriminant in describing the roots of quadratic equations.

This activity encourages students to explore graphically the effect of the discriminant upon a quadratic function.  They do this by manipulating a quadratic curve while observing the changing value of the discriminant. They are then asked various questions to help them identify the effect.

There is a 13-page TI-Nspire document that can be used either by students working on individual handhelds or by the teacher using TI-Nspire software projected on a screen  to explore the topic with the whole class. There is also a 2-page student worksheet that introduces the task and provides technical help in manipulating graphs on the screen.