September 24: Canada's Ben Johnson wins Olympic gold in 100 metres. Two days later, he is stripped of the medal after testing positive for a banned substance.
... add the square of b/(2a) to both sides, getting
<math>x^2+\frac{b}{a}x+\frac{b^2}{4a^2}=-\frac{c}{a}+\frac{b^2}{4a^2}.</math>
The left side is now a ...