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1290s

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

Decades: 1240s 1250s 1260s 1270s 1280s - 1290s - 1300s 1310s 1320s 1330s 1340s

Years: 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299

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Quadratic formula

... equation, because it discriminates between three qualitatively different cases: If the discriminant is zero, then there is a repeated solution x, and th ...