Quadratic Formula

quadratic equation

ax^2+bx+c=0

quadratic formula

x=-b plus or minus the square root of b^2-4ac over 2a

domain

x

range

y

vertical line test

draw a vertical line if it intersects more than once, it fails, graph is not a function

function

intersects once

not a function

intersects more than once

closed circle

bracket

open circle

parentheses

when a is positive

2 solutions

when a is 0

one solution

when a is negative

no solution