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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

... the explicit solution(s) x to the quadratic equation <math>ax^2+bx+c=0</math> in terms of the coefficients a, b and c, which are assumed to be real (but see ...