Changing a, b, c

Where does the vertex go?

Henri Picciotto

Start with nonzero values for the a, b, c parameters
Choose one parameter, and change it, keeping the other two constant
What is the locus (location) of the vertex?
(You can show the locus by clicking the corresponding checkbox)
Can you prove this by using algebra?

Teachers' Notes

Download the GeoGebra file.

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