Centuries: 2nd century - 3rd century - 4th century
Decades: 150s - 160s - 170s - 180s - 190s - 200s - 210s - 220s - 230s - 240s - 250s
Years: 200 201 202 203 204 205 206 207 208 209
Events:
... is the square of (x + b/(2a)). The right side can be written as a single fraction; the common denominator is 4a2. W ...