See also: List of years in literature
(Please add to this list. If you have read any of the books above, why not write an article for Wikipedia?)
... 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> ...