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

a) 3x +15
= 3*x +3*5
= 3(x +5)

b) 4y -8
= 4*y -4*2
= 4(y -2)

c) 5x +10
= 5*x +5*2
= 5(x +2)

d) 7y -21
= 7*y -7*3
= 7(y -3)