Math Medics
S.o.s. Math: Quadratic Equations
This lesson shows a step-by-step procedure for solving a quadratic equation by completing the square.
National Council of Teachers of Mathematics
Nctm: Illuminations: Proof Without Words Completing the Square
Students use this computer applet to visualize the concept of completing the square.
Discovery Education
Discovery Education: Web Math: Complete the Square on a Polynomial
This WebMath site allows the student to type in a quadratic and have it solved by the completing the square method.
Purple Math
Purplemath: Completing the Square: Ellipses Equations
Demonstrates step-by-step how to complete the square for ellipses and hyperbolas. Includes several charts and graphs for understanding.
Help Algebra
Help algebra.com: Completing the Square
The process of completing the square is presented with a detailed description of the process and an example to show the work step by step. An example with a non-integer leading coefficient is also included.
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Complete the Square
Find a quick, concise explanation of how to complete the square. An example is given and explained to illustrate the method.