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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

... to the left of "=", that will make it a perfect square trinomial of the form x2 + 2xy + y2. Since "2xy" in this case is (b/a)x, we must have y = b/(2a), so we add the ...