axis of symmetry	a line of symmetry for a graph—it divides a figure or graph into halves that are the mirror images of each other
coefficient	a number that multiplies a variable
function	a kind of relation in which one variable uniquely determines the value of another variable
intercept form of a quadratic equation	written as y = a(x – p)(x – q), where the x-intercepts are p and q
linear function	a function with a constant rate of change and a straight line graph
parabola	a U-shaped graph which is produced by a quadratic equation
polynomial	a monomial or sum of monomials, like 4x² + 3x – 10
polynomial functions	a monomial or sum of monomials, like y = 4x² + 3x – 10
quadratic equation	an equation that can be written in the form ax² + bx + c = 0 where a ¹ 0. When written as y = ax² + bx + c the expression becomes a quadratic function.
quadratic function	a function of the form y = ax² + bx + c where a is not equal to zero
range	the set of all possible outputs of a function
roots of a quadratic equation	the x-intercepts of the parabola or the solution of the equation
standard form of a quadratic equation	written as , where x and y are variables and a, b, and c are numbers with a ≠ 0. In the case of a single variable the standard form becomes ax² + bx + c = 0.
vertex	the high point or low point of a parabolic function
x-intercept	the point where a line meets or crosses the x-axis
Zero Product Property	states that if ab = 0, then either a = 0 or b = 0, or both a and b are 0