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Decades: 730s BC 720s BC 710s BC 700s BC 690s BC - 680s BC - 670s BC 660s BC 650s BC 640s BC 630s BC
Significant People
... to the left of "=", that will make it a perfect 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 ...