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Nicholas Mysticus

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Nicholas Mysticus (d. May 925) was the Patriarch of Constantinople from 893 to 906 and from 912 to 925.

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Quadratic formula

... of b/(2a) to both sides, getting <math>x^2+\frac{b}{a}x+\frac{b^2}{4a^2}=-\frac{c}{a}+\frac{b^2}{4a^2}.</math> The left side is now a perfect square; it ...