Decades: 740s 750s 760s 770s 780s - 790s - 800s 810s 820s 830s 840s
Years: 785 786 787 788 789 - 790 - 791 792 793 794 795
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... 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 roots ...