Decades: 1260s 1270s 1280s 1290s 1300s - 1310s - 1320s 1330s 1340s 1350s 1360s
Years: 1311 1312 1313 1314 1315 - 1316 - 1317 1318 1319 1320 1321
Births
Deaths
... derived by the method of completing the square[?]. <math>ax^2+bx+c=0</math> Dividing our quadratic equation by a, we have <math> x^2 + \left( ...