Réponse :
Explications étape par étape :
exercice 8
A = 6(x + y) B = 10(2 - 3a) C = 5(3a - 5b) D = 3a(3a + 4)
E = 5x(3x + 1) F = 4x(4x + 8)
exercice 9
A = (6x + 3)(4x - 5 + 3x + 1) = (6x + 3)(7x - 4)
B = (4x - 5)(2 - x + 4x - 5) = (4x - 5)(3x - 3)
C = (3x + 5)(3 - 2x - 2 - 5x) = (3x + 5)(- 7x + 1)
D = (3x + 4)(3x + 4 - 5x -6) = (3x + 4)( - 2x - 2)
E = (4x + 3)(3 - 2x - 5 + 4x) = (4x + 3)( 2x - 2)