Exercice 4:
Factoriser les expressions suivantes :
A = 3x + 9
B = 5x ² - 15x
C = 3 + 3a
D = (2x + 1)(x + 4) + (2x + 1)(3x + 2)
E = 4x ² - 49
F = (x - 5) ²- 16