How to use the quadratic formula | Polynomial and rational functions | Algebra II | Khan Academy
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:quadratic-functions-equations/x2f8bb11595b61c86:quadratic-formula-a1/v/using-the-quadratic-formula Introduction to using the quadratic formula. Practice this lesson yourself on KhanAcademy ...
YouTube
· Apr 12, 2010