Anton Drexler was a Munichlocksmith and member of the Volkische[?] agitator who founded the German Workers Party or (DAP), which later became the National Socialist German Workers Party of NSDAP. Drexler was also a member of a Volkische political club for affluent members of Munich society known as the Thule Society.
... the left of "=", that will make it a 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 ...