Réponses

2012-10-10T20:42:21+02:00

A=2x(7x+2)+(7x+2) (2x-5)

= (7x+2)(2x + 2x - 5)

= (7x+2)(4x-5)

 

B=(2x+1) (x-6)-(2x+1)²

= (2x+1)(x-6-2x-1)

= (2x+1)(-x -7)

 

En espérant t'avoir aidé.