In Polynesian mythology, Vatea is the first man (son of Varima-te-Takere), along with his wife Papa, who gave birth to a calabash[?] which Vatea made into the sky. Alternatively, Papa, a giant bird, laid an egg which became the island Hawaii. Vatea and Papa then lived there as the first man and woman.
... 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 of ...