Bonsoir,
Factoriser les expressions suivantes :
A = 9x + 18= 9(x+2)
B = 3x(x + 5) - 7(x + 5)= (x+5)(3x-7)
C = (x - 1)(3x + 7) + (2x + 5)(3x + 7)= (3x+7)(x-1+2x+5)=(3x+7)(3x+4)
D = x² - 4²= (x-4)(x+4)
E = x² - 25= x²-5²= (x-5)(x+5)
F = 16 - (x + 3)²= 4²-(x+3)²= (4-x-3)(4+x+3)= (-x+1)(x+7)= -(x-1)(x+7)
