Encyclopedia > 1640s BC

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1640s 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 1600s BC 1590s BC

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Quadratic formula

... If the discriminant is negative, then there are two different solutions x, both of which are complex numbers. The two solutions are complex conjugates of each other. ...