Réponse :
Explications étape par étape
Bonsoir
Developper réduire et ordonner :
A = 3(4x + 7) + 4(2x - 9)
A = 3 * 4x + 3 * 7 + 4 * 2x - 4 * 9
A = 12x + 21 + 8x - 36
A = 20x - 15
B = 7x(2x - 5) - x(2x - 5)
B = 7x * 2x - 7x * 5 - x * 2x - x * (-5)
B = 14x^2 - 35x - 2x^2 + 5x
B = 12x^2 - 30x
C = (2x + 5)(3x + 7)
C = 2x * 3x + 2x * 7 + 5 * 3x + 5 * 7
C = 6x^2 + 14x + 15x + 35
C = 6x^2 + 29x + 35
D = (2x - 5)(3x - 2)
D = 6x^2 - 4x - 15x + 10
D = 6x^2 - 19x + 10
