quadratic equation
Algebraic equation of particular importance in optimization. A more descriptive name is second-degree polynomial equation. Its standard form is ax2 + bx + c = 0, and its solution is given by the quadratic formula 
which guarantees two real-number solutions, one real-number solution, or two complex-number solutions, depending on whether the discriminate, b2 − 4ac, is greater than, equal to, or less than 0.
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