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

11.1  Graphing Quadratic Equations

http://www.broadeducation.com/htmlDemos/APlus/GraphQuadEq/P1000/Page.htm
This page contains a slide show with audio that explains how to graph quadratic equations.

http://revver.com/video/264850/graphing-quadratic-equations/
This site has a video which explains how to graph quadratic equations.

11.2  The Quadratic Function

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

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

11.3  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.

11.4  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.

11.5  The Zeros of a Quadratic Equation

http://www.angelfire.com/pro/grade_ten_math/Unit3/zeros.html
This site has a lesson explaining the role of the zeroes in a quadratic equation.

11.6  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.