## Encyclopedia > 1805

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# 1805

Years: 1800 1801 1802 1803 1804 - 1805 - 1806 1807 1808 1809 1810

Events

Births

Deaths

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 Quadratic formula ... getting $x^2+\frac{b}{a}x+\frac{b^2}{4a^2}=-\frac{c}{a}+\frac{b^2}{4a^2}.$ The left side is now a perfect square; it is the square of (x + ...