Bonsoir,

A = 7 + 3 (2x - 6)

A = 7 + 6x - 6

A = 6x + 1

B = 8x + (2x - 2) (3x + 1)

B = 8x + 6x² + 2x - 6x - 2

B = 6x² + 4x - 2

C = (3x * 5) (2 - 7x)

C = 15x * (2 - 7x)

C = 30x - 105x²

C = - 105x² + 30x

D = 17 - (3 - x) (4x - 2)

D = 17 - (12x - 6 - 4x² + 2x)

D = 17 - 12x + 6 + 4x² - 2x

D = 4x² - 14x + 23.