Colonists from Megara (c. 667 BC) founded Byzantium.
In the Peloponnesian War, (c. 431 BC-404 BC) Megara was an ally of Sparta.
... 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, ...