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.
... in the city of Copenhagen.
This is a disambiguation page; that is, one that just points to other pages that might otherwise have the same name. If you followed ...