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680

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

Decades: 630s 640s 650s 660s 670s - 680s - 690s 700s 710s 720s 730s

Years: 675 676 677 678 679 - 680 - 681 682 683 684 685


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Quadratic formula

... is real. (Geometrically, this means that the parabola described by the quadratic equation touches the x-axis in a single point.) If the discriminant is positive, ...

 
 
 
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