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Quadratic Equations

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What is the quadratic equation? Explain where the quadratic equation comes from. In particular, how is the quadratic equation related to the process of completing the square?

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A quadratic equation is a polynomial with a degree of 2, or the equation is at second degree. That means that the highest exponent of the variable in a quadratic equation is 2. The quadratic equation comes from the product of two linear polynomials. For example:

(x + a) (x + ...

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