Bonjour
a.
A = 3x + 6 = 3 (x + 2)
D = 12 + 18x = 6 (2 + 3x)
G = 4x² - 20x = 4x (x - 5)
R = 5x - 10 = 5 (x - 2)
E = 50 - 10x = 10 (5 - x)
H = 3x² - 5x = x (3x - 5)
C = 4x + 9x = x (4 + 9) = x (13).
F = x² + 7x = x (x + 7)
I = 12x² - 3 = 3 (4x² - 1) = 3 (2x - 1) (2x + 1)
b.
A = 7x + 7 = 7 (x + 1)
B = 3x² + 3x = 3x (x + 1)
C = 18x - 9x = 9x (2 - 1)
D = 10 - 20x = 10 (1 - 2x)
E = 4x² - 9x = x (4x - 9)
F = 10x² + 35x = 5x (2x + 7).