Réponse:
salut
alors pour le niveau 1:
3x+3 = 3(x + 1)
niveau 2:
(x+1)(4x-9)- 5(x + 1)=
(x+1)(4x-9-5)=
(x+1) (4x -14)
niveau 3:
(x+1)(9x-5)-7x-7=
(x+1)(9x-5)-7(x+1)=
(x+1)(9x-5-7)=
(x+1)(9x-12)
niveau 4:
2(x+1)(x-4)+3(x+1)(x+8)=
(x+1) [2(x-4)+3(x+8)]=
(x+1) (2x-8+3x+24)=
(x+1) (5x+16)
niveau 5:
7(x+1)(2x+1)-2(x+1)(3x-4)=
(x+1) [7(2x+1)-2(3x-4)]=
(x+1) (14x+7-6x+8)=
(x+1) (8x+15)
niveau 6:
(x+1)²+x+1=
(x+1)[(x+1)+1]=
(x+1) ( x+2)
niveau 7:
3x²-3+x+1=
3(x²-1)+(x+1)=
3[(x-1)(x+1)] +(x+1)=
(x+1) [3(x-1) +1 ]=
(x+1) (3x-3+1)=
(x+1) (3x-1)
