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.
... all the wisdom of the
schools and lifts the mind to perceive more of
eternal truth in a moment of time than a student might
learn in the schools in ten years. ...