1965 - In Selma, Alabama, State troopers and local law enforcement forcefully brake-up a group of 600 civil rights marchers. The event was televised and was dubbed "Bloody Sunday."
... denominator 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 both sides ...