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y = ax^2 + bx + c ¸¦ ¹ÌºÐÇϸé ÃÖ´ë(¼Ò)°ª¿¡¼­

0 À̹ǷΠ 2ax + b = 0 

x = -b/(2a)

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y = a*(-b/(2a))^2 + b*(-b/(2a)) + c
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