Decades: 730s 740s 750s 760s 770s - 780s - 790s 800s 810s 820s 830s
Years: 782 783 784 785 786 - 787 - 788 789 790 791 792
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... getting <math>x^2+\frac{b}{a}x+\frac{b^2}{4a^2}=-\frac{c}{a}+\frac{b^2}{4a^2}.</math> The left side is now a perfect square; it is the square of (x + ...