Khan Academy
Khan Academy: Features of Quadratic Functions
Find the zeroes ('roots') of quadratic functions and the vertex of their parabolas. Functions are given in standard, vertex, and factored form.
Khan Academy
Khan Academy: Quadratics by Factoring
Solve quadratic equations of the form ax^2+bx+c=0 that can be rewritten according to their linear factors.
Cuemath
Cuemath: Quadratic Equations
A comprehensive guide for learning all about quadratic equations with definitions, quadratic formulas, how to solve them, solved examples, and practice questions.
Other
Nearpod: Quadratic Equations: Intro & Factoring
For this lesson, students will learn the main parts of a parabola and solve quadratic equations by factoring.
Other
Nearpod: Quadratic Equations: Completing the Square
In this lesson on completing the square, students explore the connection between area models and perfect square trinomials. They also learn how to complete the square to transform a quadratic equation into vertex form.
Other
Nearpod: Multi Step Equations: A Graphical Approach
In this lesson on multiple-step equations, learners learn how to identify the solutions to linear, quadratic, and systems of equations.
Help Algebra
Help algebra.com: Quadratic Equations
This article gives a definition of quadratic equations, then demonstrates how to solve them. Factoring, completing the square and the quadratic formula are the methods described. The examples are accompanied by lists of steps for solving...
Help Algebra
Help algebra.com: Quadratic Equations
After defining a quadratic equation, this site shows you what the graphs of quadratics look like and how to use the graphs to determine the numbers of solutions to the quadratic. A brief explanation is included on how graphing...
Help Algebra
Help algebra.com: Quadratic Formula
This presentation of the quadratic equation includes a discussion on the discriminant and a derivation of the quadratic formula.
Help Algebra
Help algebra.com: Solving Quadratics by Factoring
Tips for factoring quadratics are given and demonstrated in several examples. The examples include quadratics that have both two and three terms.
Help Algebra
Helpalgebra: Geometrical Approach to Completing Square
Using geometrical diagrams, the process of completing the square is demonstrated. Applying this visual approach will help to see why the process works.
Quia
Quia: Graphing Quadratic Functions
Jeopardy type of a game will ask students to practice working with the three forms of quadratic equations. Can they: identify the form of equation, find the vertex, find the x-intercepts, identify what the graph looks like?
Sophia Learning
Sophia: Factoring Quadratic Equations When a ? 1: Lesson 5
This lesson will review how to factor and solve a quadratic equation when a ? 1. It is 5 of 5 in the series titled "Factoring Quadratic Equations when a ? 1."
ClassFlow
Class Flow: The Discriminant
[Free Registration/Login Required] Flipchart on an introduction to the discriminant for quadratic equations to determine the number of solutions.
Wyzant
Wyzant: Function Graphing Calculator
Students input a function in either y= of f(x)= form, and then the site from WyzAnt does the rest! A detailed graph is shown in less than a second. Students can change the window used to view the graph as well as whether to have...
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Quadratic Equations
Find a quick, concise explanation of the quadratic equations. An example is given and clearly explained.
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Solving Quadratic Equations With Square Roots
Find a quick, concise explanation for how to solve quadratic equations using square roots. An example is given and clearly explained.
Math Is Fun
Math Is Fun: Quadratic Equation
The tutorial examines quadratic equations. The resource consists of detailed examples and explanations about the algebra concept.
Stanford University
Quadratic Formula/explanation
A step-by-step explanation of how the quadratic formula is obtained from the general form quadratic polynomial.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Definition of Quadratic Function
Dr. Math briefly defines a quadratic function.
Math Medics
S.o.s. Math: Quadratic Equations: Basic Definitions
This S.O.S. Math tutorial offers definitions and examples of quadratic equations and quadratic functions.
Other
Completing the Square to Get a Quadratic Function Into Standard Form
This site shows students how to put a quadratic function into standard form by completing the square.
Wyzant
Wyzant: Equation Calculator
Students can input an equation and have the site solve it for them, complete with steps shown and explanations given along the way. Equations must be simple, first- or second-degree with only one variable. A quick list of rules to follow...
Purple Math
Purplemath: The Quadratic Formula Explained
An excellent discussion on solving quadratic formulas, accompanied by numerous examples.