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1690s BC

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

Decades: 1690s BC - 1680s BC 1670s BC 1660s BC 1650s BC 1640s BC

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Quadratic formula

... that the parabola intersects the x-axis in two points.) If the discriminant is negative, then there are two different solutions x, both of which are complex numbers. ...