National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Quadratic Function (Changing Coefficients)
The Dr. gives information about a method for deciding how changing the coefficients of a quadratic function affects a graph. The page also leaves some questions for the reader to ponder.
![Paul's Online Notes: Algebra Cheat Sheet [Pdf] Activity](https://d15y2dacu3jp90.cloudfront.net/images/attachment_defaults/resource/large/FPO-knovation.png "Paul's Online Notes: Algebra Cheat Sheet [Pdf] Activity")
Paul Dawkins
Paul's Online Notes: Algebra Cheat Sheet [Pdf]
An algebra "cheat sheet" to use as a reference when completing algebra homework. Lists basic facts, properties, operations, formulas, and functions, as well as common errors.
ClassFlow
Class Flow: Quadratic Formula
[Free Registration/Login Required] This flipchart teaches the Quadratic Formula and discriminant. It also uses models for when an object is thrown or dropped and has a velocity to find the distance the object traveled.
ClassFlow
Class Flow: Quadratic Formula and Some Uses
[Free Registration/Login Required] This flipchart contains problems to be used with Algebra I and/or Algebra II.
Free Math Help
Free Math Help: The Quadratic Formula
The lesson teaches students about the quadratic formula. The resource includes detailed explanations about how to use the quadratic formula.
Wyzant
Wyzant: Solving Using the Quadratic Formula Worksheet
The practice sheet reviews how to solve equations using the quadratic formula. The resource consists of 20 questions with answers available.
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 Solver
The tutorial examines how to solve quadratic equations. The resource consists of detailed examples, an interactive quadratic equation solver, and explanations about the algebra concept.
University of Illinois
University of Illinois: Quadratic Formula
This site from the University of Illinois offers an excellent simulation of the quadratic formula, where you can type in different values for a, b, and c, and then view the change in the answer for x.
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.
Purple Math
Purplemath: The Quadratic Formula Explained
An excellent discussion on solving quadratic formulas, accompanied by numerous examples.
Purple Math
Purplemath: Factoring Polynomials: How To
Demonstrates the steps involved in factoring a general polynomial, including using the Rational Roots Test and synthetic division. Shows how to "cheat" with a graphing calculator.
Purple Math
Purplemath: Solving Quadratic Equations by Factoring
Demonstrates how to solve quadratics using factoring (that is/the Zero-Product Property). Provides worked examples/and warnings about common mistakes.
Purple Math
Purplemath: Solving Polynomials: How To
Demonstrates the steps involved in solving a general polynomial, including how to use the Rational Roots Test and synthetic division. Points out when using a graphing calculator can be very helpful.
Math2
Math2.org: Polynomial Identities
This resource provides a list of polynomial identities, including formulas for squaring a binomial, FOILing a trinomial, factoring a difference of two squares, factoring a sum or difference of two cubes, and the Quadratic Formula.
Math Words
Mathwords: Quadratic Equation
The definition of a quadratic equation, followed by examples.