Recognised musical genres include the following (see the individual genre pages for more information on each genre and the musicial genres page for information about the major groupings):
... 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 correct ...