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1660s BC

Centuries: 18th century BC - 17th century BC - 15th century BC

Decades: 1690s BC 1680s BC 1670s BC - 1660s BC - 1650s BC 1640s BC 1630s BC 1620s BC 1610s BC

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Quadratic formula

... x, both of which are real. (Geometrically, this means that the parabola intersects the x-axis in two points.) If the discriminant is negative, then there are two ...