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233

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

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Quadratic formula

... "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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