SVP j'ai vraiment besoin d'aide urgent

Bonjour,

1) 
A = 9x² - 27
A = 9 (x² - 3)

B = (3x + 1) (2x - 3) - (x + 4) (3x + 1)
B = (3x + 1) [(2x - 3) - (x + 4)]
B = (3x + 1) (2x - 3 - x - 4)
B = (3x + 1) (x - 7)

C = x² - 10x + 25
C = (x - 5)²

E = 49x² + 14x + 1
E = (7x + 1)²

2)
A = (9x + 8)²
A = 81x² + 144x + 64

B = (6 - 5x)²
B = 36 - 60x + 25x²
B = 25x² - 60x + 36

C = (4x - 7) (4x + 7)
C = 16x² - 49

D = (x + 1)² + (2x - 5) (2x + 5)
D = x² + 2x + 1 + 4x² - 25
D = 5x² + 2x - 24