A = 5(10x + 8) B = 9x(6 - 4x) C = 3(4x + 7) + 4(2x - 9) D = 7x(2x - 5) - X(2x - 5) E = (2x + 5)(3x + 7) F = (5x + 8)(2x - 7) G = (7x - 6)(2 - 3x) développer pui

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A = 5(10x + 8)

A = 50x + 40

B = 9x(6 - 4x)

B = 54x - 36x^2

C = 3(4x + 7) + 4(2x - 9)

C = 12x + 21 + 8x - 36

C = 20x - 15

D = 7x(2x - 5) - X(2x - 5)

D = 14x^2 - 35x - 2x^2 + 5x

D = 12x^2 - 30x

E = (2x + 5)(3x + 7)

E = 6x^2 + 14x + 15x + 35

E = 6x^2 + 29x + 35

F = (5x + 8)(2x - 7)

F = 10x^2 - 35x + 16x - 56

F = 10x^2 - 19x - 56

G = (7x - 6)(2 - 3x)

G = 14x - 21x^2 - 12 + 18x

G = -21x^2 + 32x - 12

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