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Solve quadratic equations using the quadratic formula. For example, solve -9x+10x²+8=14.

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In these tutorials, we'll cover a lot of ground. Some of the topics include linear equations, linear inequalities, linear functions, systems of equations, factoring expressions, quadratic ...

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In this article, we review how to solve quadratics that are solvable by taking the square root—no fancy factoring or quadratic equations here; we'll get to that technique later.

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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:quadr...

https://www.khanacademy.org › math › algebra › x2f8bb11595b61c86:quadratic-functions...

Learn how to graph any quadratic function that is given in standard form. Here, Sal graphs y=5x²-20x+15.

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Start practicing—and saving your progress—now: https://www.khanacademy.org/math/alge... Introduction to using the quadratic formula. Practice this lesson yourself on KhanAcademy.org...

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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:quadr...