This unit discusses quadratic equations, their solutions, and their graphs.

This video shows the characteristic shape of quadratic graphs with a few examples.
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This video shows how to use the graph of a quadratic equation to find its roots.
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This video shows how to solve certain quadratic equations by finding a square root.
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This video develops the standard technique of completing the square.
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This video uses the completing the square technique to develop the quadratic formula.
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This video proves the quadratic formula developed in the previous video.
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This video examines the key role of the discriminant in the quadratic formula.
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This video talks about the Khan Academy vision of Social Return.
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This video compares various models of physical phenomena in the world
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