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Billiard Congress of America

Find out more about the Billiard Congress of America, including their rules for billiard games at http://www.bca-pool.com/

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Quadratic formula

... 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 sides, ...