The National Geographic Society is an organization started by Alexander Graham Bell in 1888. Its purpose is to advance the general knowledge of geography and the world among the general public. To this end, it sponsors exploration, and publishes a monthly magazine, National Geographic. It was founded on January 27, 1888 in Washington, DC.
... 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, ...