The Gunfight at the O. K. Corral is a legendary event which has been portrayed in numerous Western films. The actual event occurred in a vacant lot near the corral, in Tombstone, Arizona (a corral is like a livery stable[?]; the analogous location in Denver was called the Elephant Corral).
... (but see below for generalizations) with a being non-zero. These solutions are also called the roots of the equation. The formula reads
<math>
x=\frac{-b \pm ...