Thoughts, opinions, and ideas about Mathematics and other things from a retired teacher.

## Tuesday, October 27, 2015

## Monday, October 19, 2015

### A question for pre-calc students

This question is easily stated, but is it easily answered?

Stay tuned!!

Stay tuned!!

## Monday, October 5, 2015

### GeoGebra or Desmos?

Here is my 3-leafed rose plot in Desmos. Below you will find the same plot in Geogebra. The GeoGebra version, to me, can be presented to students earlier in their math program.

## Thursday, October 1, 2015

### Use truth values wisely!

This blog post is in reaction to Shelby Aaberg's post at Matheleticism regarding defining piecewise functions, Read that posting first! I submit a simple solution that eliminates the complex solution supplied.

All we must do is take advantage of the fact that the truth value "false" yields 0, whereas "true" yields 1, and dividing by zero is undefined. Thus multiplying by the truth value equates to multiplying by either zero or one, and dividing by the truth value goes right along with that. So dividing by the truth value is the same as dividing by either 1 or 0.

The same works at Desmos, as shown in the second graphic below.

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