QUADRATIC FUNCTIONS

A function is

**quadratic**if it has this algebraic expression: y = f(x) = ax^{2}+ bx + c (a,b,c єR, a≠0), with a polynomial of degree 2.Its graph is a

**parabola**, with a relative extremum in a point called**vertex of the parabola**.The vertex has x = -b/2a as abscissa, and the parabola has a symmetry axis in x = -b/2a.