A quadratic function is a function of the form <math>f(x)=ax^2+bx+c</math>, where a is nonzero.
In the case where the domain and codomain are R (the real numbers), the graph of such a function is a parabola.
... Demographics
As of the census of 2000, there are 14,078 people, 4,578 households, and 3,731 families residing in the town. The population density is 1,322.5/km² ...