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Decades: 790s BC 780s BC 770s BC 760s BC 750s BC - 740s BC - 730s BC 720s BC 710s BC 700s BC 690s BC
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... fraction; 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 ...