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Dark age

A dark age is a period of severe decline within a civilization. Dark ages are usually caused by famine, pestilence, war, or some combination of problems.

See also: Dark Ages

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Quadratic formula

... equation. The formula reads <math> x=\frac{-b \pm \sqrt {b^2-4ac}}{2a} </math> The term b2 – 4ac is called the discriminant of the quadratic ...

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