Réponse :
Bonjour,
[tex]A = 2x(x - 5) + 7(x - 5)\\\\= (x - 5)(2x + 7)[/tex]
[tex]B = (2x + 5)(x - 3) + (2x + 5)(-3x + 1)\\\\= (2x + 5)[(x - 3) + (-3x + 1)]\\\\= (2x + 5)(x - 3 - 3x + 1)\\\\= (2x + 5)(-2x - 2)\\\\= -2(2x + 5)(x + 1)[/tex]
[tex]C = (3y + 7)(2y - 9) + (3y + 7)(5y - 7)\\\\= (3y + 7)[(2y - 9) + (5y - 7)]\\\\= (3y + 7)(2y - 9 + 5y - 7)\\\\= (3y + 7)(7y - 16)[/tex]
