bonjour
C = 2 x (x -9) = 2 x² - 18 x
A = 5 + 4 X (3x – 6) = 5 + 12 x - 24 = 12 x - 19
B = (2x - 10) X (2x + 10) = 4 x² - 100
F = (7 - 4x) x 5 = 35 - 20 x
D = - 3X (6 + 3x) + x = - 18 - 9 x + x = - 8 x - 18
E = (4x - 2) X (3x + 5) = 12 x² + 20 x - 6 x - 10 = 12 x² + 14 x - 10
