The Zingiberales are an order of monocots, including familiar plants like bananas and ginger. They are also called the Cannales. There are eight different families:
... 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 b/(2a) to both ...