résolution d'une double inéquation


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Inéquations du second degré (1)
  • Exemple de résolution d'inéquation du second degré.
  • étape 1 : On définit les coefficients a, b et c du polynôme ax²+bx+c.
  • étape 2 : on donne le signe de a; a = 1 est positif.
  • étape 3 : On calcule le discriminant et on calcule les racines: ? = b² -4ac = 6² - 4×1×8 = 4.

Comment trouver les solutions d'une inéquation ?

On calcule le discriminant ? = b2 – 4ac de la fonction polynôme f définie par f(x) = ax2 + bx + c. Étudier le signe du discriminant ?.
. Si ? < 0, alors cette équation n'admet pas de solutions réelles.
. Si ? = 0, alors cette équation admet une solution unique .

Comment résoudre un polynôme de degré 2 ?

Méthode : Pour résoudre une inéquation produit du premier degré, on doit : 1) Etudier les signes du premier puis du second facteur dans un tableau de signes. 2) Utiliser la règle de signes pour obtenir le signe du produit et trouver l'ensemble des solutions de l'inéquation en faisant attention au sens de l'inégalité.

Comment écrire la solution d'une inéquation ?

a/ Pour résoudre l'inéquation f(x) < 0, on repère la portion de courbe au dessous de l'axe des abscisses (Ox) : les abscisses correspondantes donnent l'ensemble solution.
. Si l'inéquation à étudier est f(x) ? 0, on prend également les abscisses des points d'intersection. donnent l'ensemble solution.










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