Réponse:
Bonsoir
a. (2x-3)(x+2)-5(2x-3)
(2x-3)(x+2-5)
(2x-3)(x-3)
b. (5x+1)(3x-5)-(x-3)(5x+1)
(5x+1)(3x-5-(x-3))
(5x+1)(3x-5-x+3)
(5x+1)(2x-2)
c. (3x+2)(-5x-7)-(3x+2)(x+7)
(3x+2)(-5x-7-(x+7))
(3x+2)(-5x-7-x-7)
(3x+2)(-6x-14)
d. (5x-8)(7x-3)-(7x-3)^2
(7x-3)(5x-8-(7x-3))
(7x-3)(5x-8-7x+3)
(7x-3)(-2x-5)
Voilà
