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1275

Centuries: 12th century - 13th century - 14th century

Decades: 1220s 1230s 1240s 1250s 1260s - 1270s - 1280s 1290s 1300s 1310s 1320s

Years: 1270 1271 1272 1273 1274 - 1275 - 1276 1277 1278 1279 1280

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Quadratic formula

... is equivalent to <math>x^2+\frac{b}{a}x=-\frac{c}{a}.</math> The equation is now in a form in which we can conveniently complete th ...

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