A seaport is a major facility in a city, for the loading, unloading, and movement of cargo; to and from from oceanicships. The term also refers to a city with such a facility. (See also: port)
... expression to 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 ...