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Decades: 890s BC 880s BC 870s BC 860s BC 850s BC - 840s BC - 830s BC 820s BC 810s BC 800s BC 790s BC
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... 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 square of b/(2a) to both sides, ...