exercice n 42 merci d'avance

a)
2(5x+2) = 10x+4

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 + 4x² + 8x² + 32x + 4x + 16
B = 3x³ + 12x² + 36x + 16
 
c)
C = 4(5x - 1)(3x + 3)
C = (20x - 1)(3x + 3)
C = 60x² + 60x - 3x - 3
C = 60x² + 57x - 3
 
d)
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