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.
... fighter aircraft, designed and built by a consortium of European nations formed in 1983.
The initial members were the United Kingdom, France, Germany, Italy and ...