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720

Centuries: 7th century - 8th century - 9th century

Decades: 670s 680s 690s 700s 710s - 720s - 730s 740s 750s 760s 770s

Years: 715 716 717 718 719 - 720 - 721 722 723 724 725

Events

Umayyad caliph Umar ibn Abd al-Aziz[?] succeeded by Yazid II[?] ibn Abd al-Malik

Births

Bertrada, wife of Pippin III

Deaths

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Quadratic formula

... 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 remain correct ...