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y = ax^2 + bx + c (a¡Á0) ÀÎ ÀÌÂ÷ÇÔ¼öÀÇ ²ÀÁöÁ¡ÀÇ ÁÂÇ¥¸¦ ±¸ÇÑ´Ù.

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y/a = x^2 + (b/a)x + c/a = (x + b/(2a))^2 + c/a - b^2/(4a^2)

(x + b/(2a))^2 ´Â Ç×»ó 0 º¸´Ù Å©°Å³ª °°À¸¹Ç·Î, x = - b/(2a) ÀÏ ¶§, ÇÔ¼öÀÇ ²ÀÁöÁ¡ÀÌ µÈ´Ù.

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y = c - b^2/(4a)

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y = c - b^2/(4*a)
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