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Deriving The Quadratic Formula
Common Core: A.REI.4a

Deriving The Quadratic Formula

Author: Graham Pardun

This lesson derives the quadratic formula by solving ax^2 + bx + c = 0.

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Derivation of the Quadratic Formula

In this lesson, I'll start with ax^2 + bc + c = 0, and solve for x, deriving the quadratic formula -- hopefully in a way that makes sense at each step! This will involve completing the square, so I'll begin with showing you what that's all about, too (it's literally completing a square, which is pretty fun).