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Black Forest

The Black Forest (German Schwarzwald) is a wooded mountain region in southwestern Germany. It is the source of the Danube River. Towns: Freiburg, Bad Herrenalb[?].

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Quadratic formula

... 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, ...