Répondre :
Factoriser D.
D= (12x+3)(2x-7)-(2x-7)²
=(2x-7)(12x+3-2x+7)
=(2x-7)(10x+10)
=10(2x-7)(x+1)
D= (12x+3)(2x-7)-(2x-7)²
=(2x-7)(12x+3-2x+7)
=(2x-7)(10x+10)
=10(2x-7)(x+1)
(12x+3)(2x-7)-(2x-7)²
=(2x-7)(12x+3-2x+7)
=(2x-7)(10x+10)
=10(2x-7)(x+1)
=(2x-7)(12x+3-2x+7)
=(2x-7)(10x+10)
=10(2x-7)(x+1)