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Completing the square and the quadratic formula : How to Use the Quadratic Formula

Sal Khan, CK-12 Foundation

Abstract

Exploring quadratics and higher degree polynomials. Also in-depth look at rational functions. Source: Khan Academy (www.khanacademy.org), used under the Creative Commons Attribution-NonCommercial-ShareAlike (CC BY-NC-SA) license. All Khan Academy content is available for free at www.khanacademy.org. Khan Academy does not endorse the World Public Library.

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