Réponse :

Bonjour

Explications étape par étape :

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)

B = 3x²+2x +6x +4

B = 3x²+ 8x+4

ainsi B = (x+2)(3x+2)(x+4)

B = (3x²+8x+4) (x+4)

B = 3x³+12 x² + 8x²+ 32x+ 4x +16

B = 3x³+20x² +36x +16

C = 4 (5x-1)(3x+3)

C = (20x-4) (3x+3)

C = 60x² +60x -12x -12

C = 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