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Stephen Porphyrogometus

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Stephen Porphyrogometus (d. 893) was the Patriarch of Constantinople from 886-893. He was a son of Byzantine Emperor Basil I and the youngest brother of Emperor Leo VI.

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Quadratic formula

... equation is now in a form in which we can conveniently complete the square[?]. To "complete the square" is to add a constant (i.e., in this case, ...