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256

Centuries: 2nd century - 3rd century - 4th century

Decades: 200s 210s 220s 230s 240s - 250s - 260s 270s 280s 290s 300s

Years: 251 252 253 254 255 - 256 - 257 258 259 260 261

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Quadratic formula

... Since "2xy" in this case is (b/a)x, we must have y = b/(2a), so we add the square of b/(2a) to both sides, ...

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