이차방정식의 실근의 조건

  1. 이차방정식의 실근의 부호
    이차방정식의 두 근이 실근이면 이차방정식의 두 근을 직접 구하지 않고 판별식과 근과 계수의 관계를 이용하여 두 실근의 부호를 쉽게 알 수 있다.
    이차방정식 ( 는 실수 의 두 실근을 , , 판별식을 라 하면
    1. 두 근이 모두 양수일 조건
      , ,
    2. 두 근이 모두 음수일 조건
      , ,
    3. 두 근이 서로 다른 부호일 조건

  2. 이차방정식의 실근의 위치
    가 실수인 이차방정식 의 두 실근은 이차함수 의 그래프와 의 교점의 좌표이므로 이차함수의 그래프를 이용하여 이차방정식의 실근의 위치를 판별할 수 있다.
    이차방정식 의 두 실근의 위치를 판별하기 위해서는 이차함수 의 그래프를 그린 후, 다음 세 가지 조건을 확인해야 한다.
    (i) 판별식 의 부호 (ii) 경계에서의 함숫값의 부호 (iii) 축의 위치
    따라서 이차방정식 의 두 실근 와 상수 사이의 대소 관계의 조건을 이차함수의 그래프를 이용하여 알아보면 다음과 같다.
두 근이 모두 보다 크다. 두 근이 모두 보다 작다. 두 근 사이에 가 있다. 두 근이 모두
사이에 있다.




(i)
(ii) 0
(iii)
(i)
(ii) 0
(iii)
(i)
(ii) 0,

(iii)
두 근이 모두 p보다 크다. 두 근이 모두 p보다 작다. 두 근 사이에 p가 있다. 두 근이 모두<br> p,q 사이에 있다. 'data:image/svg+xml;base64,<?xml version="1.0" encoding="utf-8" standalone="no"?>
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