The Focke-Wulf Fw 44 was a two-seater biplane known as the Stieglitz (Goldfinch).
It was produced by Focke-Wulf for pilot training and aerobatics. The Luftwaffe used the Fw 44C - the final version - almost universally as a trainer during World War II.
... real. (Geometrically, this means that the parabola described by the quadratic equation touches the x-axis in a single point.)
If the discriminant is positive, then there ...