Bonjour
A = 7 + 3 (2x - 6)
A = 7 + 6x - 18
A = 6x - 11
B = 8x + (2x - 2) (3x + 1)
D = 8x + 6x² + 2x - 6x - 2
D = 6x² + 4x - 2
C = (3x * 5) (2 - 7x)
C = 15x (2 - 7x)
C = 30x - 105x²
C = - 105x² + 30x
D = (2 + 7x) (2 - 7x) - 5x (7x + 3)
D = 4 - 49x² - 35x² - 15x
D = - 84x² - 15x + 4.
