Cyrus West Field (1819-1892) was an American financier who, along with Samuel Morse, founded a corporation to lay the first transatlantic telegraph cable between Newfoundland and Ireland. This telegraph cable, laid in 1858, lasted only for one month.
... solutions x, both of which are real. (Geometrically, this means that the parabola intersects the x-axis in two points.)
If the discriminant is negative, then there are ...