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[b][size=200]이차함수[/size]는 함수의 최고차항의 차수가 2인 다항함수를 말하며, [br] [br] 이차함수의 그래프는 포물선 형태이다.[/b][br][b][br]이차 함수의 일반형은 [u][math]f(x)=ax^2+bx+c[/math][/u]이다. 이 때, a는 0이 아니어야 한다.[/b]
