Two applets I found that would be very useful in a beginning algebra class are the following:
the domain of a function and the range of a function
These are both very good ways of showing all the values of the domain or the range in a very visual way.
Another useful applet I would use is one which shows extraneous roots and where they appear on a graph. This applet would be very good in again a beginning algebra class:
The following applet would be used in a more advanced class, for example pre-calculus, when teaching polar coordinates. It is a very easy way to show the comparison of rectangular coordinates:
polar vs. rectangular coordinates
I would really like to learn how to re-create the applets for domain and range so that I can choose graphs for students to practice with instead of the given ones on the applet.
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