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Khan Academy
Khan Academy: Algebra: Completing the Square for Quadratic Equations
Demonstrates how to complete the square for the general form of a quadratic equation, ax^2 + bx + c = 0, which results in the quadratic formula. [9:31]
Imagine Learning Classroom
Learn Zillion: Derive the Quadratic Formula: Completing the Square
In this lesson, you will learn how to derive the quadratic formula by completing the square. [6:01]