The vertex is also called the . The vertex is the point on the parabola that the function is either at the or value. The of is the vertical line through the that divides the parabola into two halves.

The x-intercept(s) are where the function value is . There may be , or x-intercepts of a parabola.

These points are called or . The expressions (x – r1) and (x-r2), where

r1 and r2 are the x values that produce a function value of zero, are called the of the quadratic.

The y-intercept of a parabola is the point where the x value is . A parabola always has y-intercept.

The domain of any function (including quadratic functions) is the set of all possible x-values. Typically, the domain of a parabola is ___