pourriez vous m 'aider s'il vous plait merci le numero 42

a)
A = 2 (5x + 2) (3x + 1)
A = (10x + 4) (3x + 1)
A = 30x² + 10x + 12x + 4
A = 30x² + 22x + 4

b)
(x + 2) (3x + 2)
= 3x² + 2x + 6x + 4
= 3x² + 8x + 4

B = (x + 2) (3x + 2) (x + 4)
B = (3x² + 8x + 4) (x + 4)
B = 3x³ + 12x² + 8x² + 32x + 4x + 16
B = 3x³ + 20x² + 36x + 16

c)
4 (5x - 1) (3x + 3)
= (20x - 4) (3x + 3)
= 60x² + 60x - 12x - 12
= 60x² + 48x - 12

D = (1 - x) (1 + x) (2x + 1)
D = (1 + x - x - x²) (2x + 1)
D = (1 - x²) (2x + 1)
D = 2x + 1 - 2x³ - x²
D = - 2x³ - x² + 2x + 1