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.
... Nations: A Great Adventure (New York: Transnational Publishers, 1984)
Beaudoin G.-A. & E. Ratushny, The Canadian Charter of Rights and Freedoms 2nd ed. (Carswell, ...