Air Marshal is a three-star rank in the Royal Air Force. It is the second most senior rank active in the RAF today, after the inactivation of Marshal of the Royal Air Force[?] as a substantive rank in peacetime[?] during defence cuts of the 1990s.
... (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 are ...