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# Grade 8 Chapter 9

### Quadratic Functions and Equations

axis of symmetry A line that divides a plan figure or a graph into two congruent reflected halves.
completing the square A process used to form a perfect-square trinomial.
discriminant b^2 - 4ac
maximum The y-value of the highest point on the graph of the function.
minimum The y-value of the lowest point on the graph of the function.
parabola The shape of the graph of a quadratic function.
quadratic equation An equation that can be written in the form ax^2 + bx +c = 0, where a,b, and c are real numbers and a is not equal to zero.
quadratic function A function that can be written in the form f(x)= ax^2 + bx + c, where a,b, and c are real numbers and a is not equal to zero.
vertex The highest or lowest point on the parabola.
zero of a function For the function f, any number x such that f(x) = 0
Created by: bookannelid