Math Is Fun
Math Is Fun: Derivation of Quadratic Formula
The learning resource investigates the quadratic formula. Students learn how the formula is derived by completing the square and solving for x.
Math Medics
S.o.s. Math: Quadratic Equations Quadratic Formula
Here you can find a general overview of the quadratic formula, complete with a full breakdown of how to come up with the quadratic formula with a quadratic equation, as well as am example of using the quadratic formula to solve a...
CK-12 Foundation
Ck 12: Algebra: Quadratic Formula
[Free Registration/Login may be required to access all resource tools.] This lesson covers deriving the quadratic formula and using it to solve any quadratic equation.
Wolfram Research
Wolfram Math World: Quadratic Equation
This MathWorld site shows how to derive the quadratic formula.
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.
Lawrence Hall of Science
The Math Page: Topics in Pre Calculus: Completing the Square
Here is a site that clearly and thoroughly explains how to solve quadratic equations by completing the square. The quadratic formula is derived using this method on this page. Point this site out to students who have been absent or who...
Other
Center for Technology and Teacher Education: Parabola Lesson Plan
This site is a lesson plan on construction of a parabola using the definition. Geometer's Sketch Pad software is beneficial for the lesson. Through the lesson learners develop gemetric constructions of parabolas, use the distance formula...