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Decades: 720s BC 710s BC 700s BC 690s BC 680s BC - 670s BC - 660s BC 650s BC 640s BC 630s BC 620s BC
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... sides, we get <math>x=\frac{-b}{2a}\pm\frac{\sqrt{b^2-4ac}}{2a}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}.</math> Generalizations The formula and its proof ...