"Vision" can mean an imagined picturing originating with not-so-divine sources: politicians, business planners and change gurus play on this sense of the word.
... we 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 ...