bonjour
factoriser les expressions:
a. 3x+15
b. 4y-8
c. 5x+10
d. 7y-21

mes reponses:
a. 3x+15
  = 3(x+5)

b. 4y-8
   = 4(y-2)

c. 5x+10
  = 5(x+2)

d. 7y-21
  = 7(y-3)
est ce exact ?