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Deriving the Quadratic Formula

Factoring and Solving Quadratic Equations

Factoring Quadratic Expressions: $x^2 + bx + c$
Factoring Quadratic Expressions: $ax^2 + bx + c$
Polynomial Division
Completing the Square
Deriving the Quadratic Formula
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Front Porch Math > > Deriving the Quadratic Formula

In this video, we show how you can derive the quadratic formula using the steps involved when completing the square.

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0:00 Getting the equation into the form $x^2 + bx =c$
0:55 Adding $(\tfrac{1}{2})^2$ to both sides
1:47 Factoring the left hand side of the equation
2:05 Taking the square root of both sides
2:25 Solving for $x$

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