Algebra 1 - 4th Edition

Chapter 8: Quadratic Equations and Functions

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Some links are repeated for use with more than one lesson.

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This site applies to the entire chapter.

http://www.sosmath.com/algebra/quadraticeq/bdef/bdef.html
This site defines a quadratic function and a quadratic equation and shows examples of each.

http://www.explorelearning.com/index.cfm?method=cResource.dspResourcesForCourse&CourseID=245
This site contains gizmos that graph the quadratic function and inequalities.

8.1 Graphing Quadratic Equations

http://www.purplemath.com/modules/grphquad.htm
This series of pages discusses how to graph and interpret graphs of quadratic equations.

http://www.mathsisfun.com/algebra/quadratic-equation-graphing.html
An illustrated tutorial on graphing quadratic equations, including how to interpret and use the general quadratic form.

8.2 The Quadratic Function

http://www.sosmath.com/algebra/quadraticeq/signquadra/signquadra.html
This site shows how to find the sign of a quadratic function.

8.3 Solving a Quadratic Equation by Factoring

http://www.coolmath.com/algebra/Algebra1/11Quadratics/02_solvefactoring.htm
This site contains notes on solving quadratic equations by factoring and includes examples and practice problems.

http://www.purplemath.com/modules/solvquad.htm
This page contains an explanation of how to solve quadratic equations using factoring by solving examples.

8.4 Completing the Square

http://www.freemathhelp.com/Lessons/Algebra_2_Completing_the_Square_and_the_Quadratic_Formula_BB.htm
This page contains a video tutorial with notes covering completing the square.

http://www.mathsisfun.com/algebra/completing-square.html
This site contains description on how to complete the square with several examples on different cases of problems.

8.5 The Zeros of a Quadratic Equation

http://www.sosmath.com/algebra/quadraticeq/root/root.html
This page gives some examples of finding the zeros of quadratic equations.

http://www.purplemath.com/modules/quadform.htm
This series of pages shows how to identify and find the zeros or roots of quadratic equations. It uses some material covered in your next lesson.

8.6 The Quadratic Formula

http://www.freemathhelp.com/quadratic-formula.html
This page contains an explanation of the quadratic formula as well as examples for clarity.

http://www.sosmath.com/algebra/quadraticeq/quadraformula/quadraformula.html
This page explains the quadratic formula and how to use it.

8.7 Systems that Include Quadratics

http://www.mathsisfun.com/algebra/systems-linear-quadratic-equations.html
NEW This site describes and provides practice for solving systems of equations that include both a linear and a quadratic equation.

http://www.regentsprep.org/Regents/math/algtrig/ATE5/indexATE5.htm
NEW This site describes and provides practice for solving systems of equations that include both a linear and a quadratic equation.