Function Graphing

Fitting a quadratic graph on a picture: adjust equation manually or use the FitPoly[] command

http://www.geogebratube.org/material/show/id/22159

Compare ax^2 and ax^2+bx, focusing on the vertical shift of individual points.

http://www.geogebratube.org/material/show/id/22094

Quadratic graph through 3 points

Trigonometric graph in degree mode

Logistic function and transformation

http://www.geogebra.org/en/upload/files/arthur/070330a1.html