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1210s

Centuries: 12th century - 13th century - 14th century

Decades: 1160s 1170s 1180s 1190s 1200s - 1210s - 1220s 1230s 1240s 1250s 1260s

Years: 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219


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Quadratic formula

... the left of "=", that will make it a perfect 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 ...

 
 
 
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