Decades: 1240s 1250s 1260s 1270s 1280s - 1290s - 1300s 1310s 1320s 1330s 1340s
Years: 1290 1291 1292 1293 1294 - 1295 - 1296 1297 1298 1299 1300
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... square roots of both sides yields <math>x+\frac{b}{2a}=\frac{\pm\sqrt{b^2-4ac}}{2a}.</math> Subtracting b/(2a) from ...