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Réponse :

Bonjour

A = 4x - 4y = 4(x - y)

B = 49a - 7 b = 7×7a - 7b = 7(7a - b)

C = 3x² + 7x = x(3x + 7)

D = 3x - x x(3 - 1) = 2x

E = (x - 3)(x - 2) + 5(x - 3) = (x - 3)(x - 2 + 5) = (x - 3)(x + 3)

F = 3(5 - 9x) - (5 - 9x)(1 - 3x) = (5 - 9x)(3 - 1 + 3x) = (5 - 9x)(2 + 3x)

G = (2x - 5)(7x + 5) - (2x - 5)² = (2x - 5)(7x + 5 - 2x + 5) = (2x - 5)(5x + 10)

H = (3x - 7)² + (1 - 2x)(3x - 7) = (3x - 7)(3x - 7 + 1 - 2x) = (3x - 7)(x - 6)