Centuries: 2nd century - 3rd century - 4th century
Decades: 240s 250s 260s 270s 280s - 290s - 300s 310s 320s 330s 340s
Years: 287 288 289 290 291 - 292 - 293 294 295 296 297
Births
Deaths
... square roots of both sides yields <math>x+\frac{b}{2a}=\frac{\pm\sqrt{b^2-4ac}}{2a}.</math> Subtracting b/(2a) from both sides, we ...