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188

Centuries: 1st century - 2nd century - 3rd century

Decades: 130s 140s 150s 160s 170s - 180s - 190s 200s 210s 220s 230s

Years: 183 184 185 186 187 - 188 - 189 190 191 192 193

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Quadratic formula

... 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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