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1163

Centuries: 11th century - 12th century - 13th century

Decades: 1110s 1120s 1130s 1140s 1150s - 1160s - 1170s 1180s 1190s 1200s 1210s

Years: 1158 1159 1160 1161 1162 - 1163 - 1164 1165 1166 1167 1168


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Quadratic formula

... 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 is ...

 
 
 
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