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Native Chinese, just came to the US two years ago. Studying political science, concentrating on international business. Would like to learn from friendly people, and make friends with each other.

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Quadratic formula

... reads <math> x=\frac{-b \pm \sqrt {b^2-4ac}}{2a} </math> The term b2 – 4ac is called the discriminant of the quadratic equation, because it ...