Ardashir III, king of Persia from 628 to 630. Son of Kavadh II, he was raised to the throne as a boy of seven years, but was killed two years afterwards by his general, Shahrbaraz.
... is now a perfect square; it is the square of (x + b/(2a)). The right side can be written as a single fraction; the common denominator is 4a2. W ...