The Etruscans were a race of northern Italians eventually integrated into Rome. Many of the deities listed below were eventually part of the Roman pantheon.
... 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 of b/(2a) to both sides, ...