Bonjour,

Factoriser:

A(x)= (5x+4)(x+2+8-3x)= (5x+4)(-2x+10)= -2(5x+4)(x-5)

B(x)= [ (3x-2)(x+4)-(7x+4) ]= (3x-2)(x+4-7x-4)= -6x (3x-2)

C(x)= (x+4)(2x-7+3x)= (x+4)(5x-7)

D(x)= (8-3x)(5- (-3x+11)= (8-3x)(5+3x-11)= (-3x+8)(8x-6)= -3(3x-8)(x-2)