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1580s BC

Centuries: 17th century BC - 16th century BC - 15th century BC

Decades: 1630s BC 1620s BC 1610s BC 1600s BC 1590s BC - 1580s BC - 1570s BC 1560s BC 1550s BC 1540s BC 1530s BC

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Quadratic formula

... of b/(2a) to both sides, getting <math>x^2+\frac{b}{a}x+\frac{b^2}{4a^2}=-\frac{c}{a}+\frac{b^2}{4a^2}.</math> The left side is now a perfect square; it ...