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

Decades: 640s 650s 660s 670s 680s - 690s - 700s 710s 720s 730s 740s

Years: 691 692 693 694 695 696 697 698 699 700 701

Births

Deaths

... is 4a2. We get <math>\left(x+\frac{b}{2a}\right)^2=\frac{-4ac+b^2}{4a^2}=\frac{b^2-4ac}{4a^2}.</math> Taking square roots of bo ...