Répondre :
A(x) = (5x-1)* + 10x -2
=(5x-1)(5x-1+2)
=(5x-1)(5x+1)
B(x) = 9x + 6 - (3x+2)*
=(3x+2)(3-3x-2)
=(3x+2)(-3x+1)
C(x) = (2x+5)(2-x) - 2+x
=(2-x)(2x+5-1)
=(2-x)(2x+4)
D(x) = x(x+2)-x-2
=(x+2)(x-1)
=(5x-1)(5x-1+2)
=(5x-1)(5x+1)
B(x) = 9x + 6 - (3x+2)*
=(3x+2)(3-3x-2)
=(3x+2)(-3x+1)
C(x) = (2x+5)(2-x) - 2+x
=(2-x)(2x+5-1)
=(2-x)(2x+4)
D(x) = x(x+2)-x-2
=(x+2)(x-1)