February 11 - James Buster Douglas[?] defeated Mike Tyson by a knockout in round 10 to win the world's unified Heavyweight title, in what many consider boxing's biggest upset ever.
... the equation. The formula reads
<math>
x=\frac{-b \pm \sqrt {b^2-4ac}}{2a}
</math>
The term b2 – 4ac is called the discriminant of the quadratic ...