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Standard Industrial Classification

The Standard Industrial Classification is a United States government system for classifying industries by a four-digit code. Established in 1987, it has since been supplanted by the six-digit North American Industry Classification System[?] in 1997.



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Quadratic formula

... so we add the square of b/(2a) to both sides, getting <math>x^2+\frac{b}{a}x+\frac{b^2}{4a^2}=-\frac{c}{a}+\frac{b^2}{4a^2}.</math> The left side is now ...

 
 
 
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