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221

Centuries: 2nd century - 3rd century - 4th century

Decades: 170s 180s 190s 200s 210s - 220s - 230s 240s 250s 260s 270s

Years: 216 217 218 219 220 - 221 - 222 223 224 225 226

Events

Liu Bei, Chinese warlord and descendant of the royal family of the Han Dynasty, proclaimed himself emperor. The Shu Han Kingdom was established.

Births

Deaths

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... of b/(2a) to both sides, 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 ...