bonjour, esce que pouvez vous m'aider svp ​

Bonsoir,

A = 5x (x + 1)

A = 5x² + 5x

B = (x + 2) (2x + 1)

B = 2x² + x + 4x + 2

B = 2x² + 5x + 2

C = (3 - 2x) (x - 8)

C = 3x - 24 - 2x² + 16x

C = - 2x² + 3x + 16x - 24

C = - 2x² + 19x - 24

D = (x - 3)²

D = x² - 6x + 9

E = 8 (x + 2) + (4x + 1) (2x - 3)

E = 8x + 16 + 8x² - 12x + 2x - 3

E = 8x² + 8x + 2x - 12x + 16 - 3

E = 8x² - 2x + 13