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https://www.khanacademy.org/math/algebra-1-illustrative-math/x6418b49dfbc9d0c9:quadratic-equations-part1/x6418b49dfbc9d0c9:how-many-solutions/v/determining-the-number-of-solutions-of-a-quadratic-graphically
Use graphs to determine whether quadratic equations have two solutions, one solution, or no real solutions.
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