Réponse :
on factorise les expressions suivantes:
A= 6x - x (x + 1)
A = x [ 6 - (x +1)]
A = x ( 6 - x - 1)
A = x (5 -x)
B= x (9x - 2) - x
B = x[ (9x -2) - 1]
B = x (9x - 2 - 1)
B = x(9x - 3)
B = 3x(3x - 1)
C = (y – 1)²-(y + 3) (y - 1)
C = (y - 1)[(y -1) - (y +3)]
C = (y - 1)(y -1 - y -3)
C = (y -1) (-4)
C = -4(y - 1)
D=7 (a + 2) + (a + 2)(3 - a)
D = (a + 2) [7 + (3 -a)]
D = (a + 2) (10 - a)
j'espère avoir pu aider.
