(continue with 1975)
Austrian Offices in Crete[?] 1903-1914. all
Austrian Offices in the Turkish Empire[?] 1867-1914, all
... perfect square trinomial of the form x2 + 2xy + y2. Since "2xy" in this case is (b/a)x, we must have y = b/(2a), so we add the square of b/(2a) to both sides, ...