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620

Centuries: 6th century - 7th century - 8th century

Decades: 570s 580s 590s 600s 610s - 620s - 630s 640s 650s 660s 670s

Years: 615 616 617 618 619 - 620 - 621 622 623 624 625

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Quadratic formula

... b/(2a) from both sides, we get <math>x=\frac{-b}{2a}\pm\frac{\sqrt{b^2-4ac}}{2a}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}.</math> ...

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