Spy Kids is a name of three different films from 2001 to 2003. The latest, Spy Kids 3-D: Game Over is scheduled for release on July 25, 2003. The Spy Kids movies are about the children of a married spy couple who become involved in their parents' espionage.
... formula is not ideal. See Loss of significance for details.
Derivation
The quadratic formula is derived by the method of completing the square[?]. ...