The National Hot Rod Association, known as the NHRA, was founded by Wally Parks[?] in 1951 in the State of California to provide a governing body to organize and promote the sport of drag racing. The "Nationals", held in the summer and the winter each year, are the premier events in drag racing that brings together the best cars and drivers from across North America.
... are real. (Geometrically, this means that the parabola intersects the x-axis in two points.)
If the discriminant is negative, then there are two different solutions x, ...