Example 3: Using the quadratic formula | Quadratic equations | Algebra I | Khan Academy HD

24.06.2010
U10_L1_T3_we3 Quadratic Formula 3 More free lessons at: http://www.khanacademy.org/video?v=XUvKjC21fYU Content provided by TheNROCproject.org - (c) Monterey Institute for Technology and Education...

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