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173

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

Decades: 120s 130s 140s 150s 160s - 170s - 180s 190s 200s 210s 220s

Years: 168 169 170 171 172 - 173 - 174 175 176 177 178

Events:

Births:

Deaths:

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Quadratic formula

... derived by the method of completing the square[?]. <math>ax^2+bx+c=0</math> Dividing our quadratic equation by a, we have <math> x^2 + \left( ...

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