Réponses

2012-10-01T16:15:46+02:00

Développement :

 

(2x+1)(3x+5)*(2x+1)² = (3x+5)*(2x+1)^3

 

                                = (3x+5)*[1+9x+27x²+27x^3^]

 

                                = 3x+27x²+81x^3+81x^4+5+45x+135x²+135x^3

 

                                = 81x^4+216x^3+162x²+48x+5

 

Factorisation :

 

81x^4+216x^3+162x²+48x+5 = ...?

 

Désolé je continue à chercher.