Bjr , Factoriser (x-1) (x(x+1)-2) merci d'expliquer
Mathématiques
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Question
Bjr , Factoriser (x-1) (x(x+1)-2) merci d'expliquer
1 Réponse
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1. Réponse emma6974
Réponse :
Bjr,
(x-1) (x(x+1)-2) = (x-1) (x²+x-2)
(x-1) (x(x+1)-2) = (x-1) (x²-1+x-1)
(x-1) (x(x+1)-2) = (x-1) ((x+1)(x-1)+x-1)
(x-1) (x(x+1)-2) = (x-1) (x-1) (x+1+1)
(x-1) (x(x+1)-2) = (x-1)² (x+2)