Notable outlaw motorcycle gangs[?] have included:
There have also been scooter gangs[?], notably the Mods in the UK in the 1960s.
... 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> Generalizations The ...