Centuries: 2nd century - 3rd century - 4th century
Decades: 180s 190s 200s 210s 220s - 230s - 240s 250s 260s 270s 280s
Years: 228 229 230 231 232 - 233 - 234 235 236 237 238
Births
Deaths
... \frac{c}{a}=0 </math> which is equivalent to <math>x^2+\frac{b}{a}x=-\frac{c}{a}.</math> The equation is now in a form in which we ca ...