## Encyclopedia > 720

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# 720

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

Events

Births

Deaths

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 Quadratic formula ... get $x=\frac{-b}{2a}\pm\frac{\sqrt{b^2-4ac}}{2a}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}.$ Generalizations The formula and its proof remain correct ...