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수학동아 - 폴리매스
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집고양이 2020.02.05 09:20 조회 658
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페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

그 85쪽에, x의 계수가 1일 따 2차방정식의 근을 더 쉽게 구한다는게 

이미 인수분해를 했으면 이미 근이 나온건데 왜 굳이 더 추가를 하죠?

풀이 과정1에서, x2-2x-24=(x-r)(x-s)으로 인수분해를 해서, r이랑 s를 찾는다고 했는데, 그 r이랑 s가 근인데요?

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  •  
    조가현 편집장 Lv.15 2020.02.05 18:37

    수학동아를 보는 독자 중에는 아직 인수분해를 모르는 친구도 있어서 숫자 예시를 간단한 걸로 들어서 그래요.

    이 방식이 인수분해가 안 되는 2차 방정식도 풀 수 있는 거거든요.

    근의 공식처럼 어떤 2차 방정식도 풀 수 있는 방법이니

    한번 인수분해가 안 되는 식을 가지고 따라해보세요. 그러면 이해가 될 거예요. 

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