## GeoGebra Short-Term Course Concluded

Last Saturday, June 5, 2010, we have concluded our 3-Saturday seminar on Using GeoGebra in Teaching Mathematics. Below are some of the pictures  taken from the said short-term course.

That’s me on the first pic explaining the mathematics behind the “how-to” construction. If you’re wondering why our whiteboard is high, well, I am just short. I am 5’3” feet, or maybe shorter (chuckles).

As you can see, the participants are really serious. 🙂

One of our participants constructing her GeoGebra applet.

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So if you want to invite me* to conduct a lecture on GeoGebra in your school, I am just an email away.

*Philippines only (unless, of course, your school is willing to shoulder my expenses. Just kidding  🙂 ).

## GeoGebra Tutorial 17 – Functions, Tangent Lines and Derivatives

This is the 17th tutorial of the GeoGebra Intermediate Tutorial Series. If this is your first time to use GeoGebra, I strongly suggest that you read the GeoGebra Essentials Series.    In this tutorial, we are going to use slider control a, b, c, d and e and graph the function f(x) = ax4 + bx3 + cx2 + dx + e.

Figure 1

We then  construct a line tangent to the function and passing through  point A and trace the graph of the point whose x-coordinate is the x-coordinate of A, and whose y-coordinate as the  slope of the tangent line. We compute for the derivative of f(x), and see if  there is a relationship between the trace and the derivative. If you want to follow the this tutorial step by step, you can open the GeoGebra window. Before following the tutorial, you may want to see the final output.