Le coup du 1 Factoriser chaque expression. A = 5x + 5 B = 3x - 6x² C = 3x + 2 + 2x(3x + 2) D = (x + 9)(x + 6) + x + 9 E = (2x - 5)² + 2x - 5 Merci d'avance pour

A= 5(x + 1)

B= 3x(1 - 2x)

C= (3x + 2)(1 + 2x)

D= (x + 9)(x + 6 + 1)
D= (x + 9)(x + 7)

E= (2x - 5)(2x - 5 + 1)
E= (2x - 5)(2x - 4)
E= 2(2x - 5)(x - 2)

Pour factoriser, il faut trouver un facteur commun.

A = 5x + 5 ← 5=5×1
A = 5(x+1)

B = 3x - 6x²
B = 3x × 1 - 3x × 2x
B = 3x(1-2x)

C = 3x + 2 + 2x(3x + 2 )
C = 1(3x+2)+2x(3x+2)
C = (3x+2)(1+2x)

D = (x+9)(x+6)+x+9
D = (x+9)(x+6)+1(x+9)
D = (x+9)(x+6+1)
D = (x+9)(x+7)

E = (2x-5)²+2x-5
E = (2x-5)(2x-5)+1(2x-5)
E = (2x-5)(2x-5+1)
E = (2x-5)(2x-4)