Jacques Offenbach (June 20, 1819 -October 4, 1880), composer and cellist, the creator of "La vie Parisienne" and an originator of the operetta form, a precursor of the modern musical comedy. He wrote a great deal of dance music, particularly for the can-can.
... are two different solutions x, both of which are real. (Geometrically, this means that the parabola intersects the x-axis in two points.)
If the discriminant is ...