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Decades: 650s BC 640s BC 630s BC 620s BC 610s BC - 600s BC - 590s BC 580s BC 570s BC 560s BC 550s BC
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... a form in which we can conveniently complete the square[?]. To "complete the square" is to add a constant (i.e., in this case, a quantity that does not depend on x) to ...