In Greek mythology, Eupeithes was the father of Antinous, the leader of the suitors of Penelope. After his son's death at the hands of Odysseus, Eupeithes tried to revolt against his rule. He was killed by Odysseus' father, Laertes.
... 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, ...