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METHODES DE FACTORISATION

Rappel

Effectuer : 

2 x2 - 3 x + 5 - x2 + 2 x - 4

Motivation

Une méthode qui consiste à écrire sous forme d'un produit de facteur s'appelle comment ?

Annonce du Sujet

 

Analyse

Définir factoriser

Citez les méthodes de factorisation

Qu'est-ce que nous venons de voir ?

 

 

Effectuer : 

2 x2 - 3 x + 5 - x2 + 2 x - 4

=(2 x2 - x2)+ (- 3 x+ 2 )+5-4

= x2 - x + 1

Une méthode qui consiste à écrire sous forme d'un produit de facteur s'appelle la factorisation.

Aujourd'hui nous allons étudier les méthodes de factorisation.

Définition

Factoriser un polynôme c'est l'écrire sous forme d'un produit de facteurs.

Méthodes de factorisation

1.Mise en évidence

45 a2 b - 60 a3 b5 + 15 ab

         15 ab (3 a - 4 a2 b4 + 1)

2.Emploi des identités remarquables

Une identité est une égalité qui est vérifiée pour toutes les valeurs attribuées aux variables qu'elle renferme.

(a + b)2 = a2 + 2 ab + b2

(a - b)2 = a2 - 2 ab + b2

Nous venons de voir les méthodes de factorisation.

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