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1180s

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

Decades: 1130s 1140s 1150s 1160s 1170s - 1180s - 1190s 1200s 1210s 1220s 1230s

Years: 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189

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Quadratic formula

... \pm \sqrt {b^2-4ac}}{2a} </math> The term b2 – 4ac is called the discriminant of the quadratic equation, because it discriminates between three ...