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Goryeo Dynasty

In Korea, the Goryeo Dynasty (고려; 高麗; 918-1392) followed Silla[?] and preceded the Joseon Dynasty[?].

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Quadratic formula

... the common denominator is 4a2. We get <math>\left(x+\frac{b}{2a}\right)^2=\frac{-4ac+b^2}{4a^2}=\frac{b^2-4ac}{4a^2}.</math> Taking square roots of ...