The standard form of a quadratic is . Most students understand the effects of *a* and *c* on the graph of the parabola, but what does *b* do? I hinted at this problem earlier, but just created and uploaded a GeoGebraTube Web document to model the problem.

In class, that’s about all I give before releasing my students to explore on their own. As always, my students are required to do two things: ** state** their conjecture and

**that it works.**

*prove*Results from my students coming in a future post.