Bonjour esque vous pouvez m aider pour l exercice 2 svp

Bonsoir,

A = (2x + 1)² - (x + 3)²

A = 4x² + 4x + 1 - (x² + 6x + 9)

A = 4x² + 4x + 1 - x² - 6x - 9

A = 4x² - x² + 4x - 6x + 1 - 9

A = 3x² - 2x - 8

B = (2x + 3)² - (x - 7) (x + 7)

B = 4x² + 12x + 9 - (x² - 49)

B = 4x² + 12x + 9 - x² + 49

B = 4x² - x² + 12x + 9 + 49

B = 3x² + 21x + 49

C = (x + 2) (x - 2) - (x - 3)²

C = x² - 4 - (x² - 6x + 9)

C = x² - 4 - x² + 6x - 9

C = x² - x² + 6x - 4 - 9

C = 6x - 13

D = (x - 5)² - (2x - 7) (x - 5)

D = x² - 10x + 25 - (2x² - 10x - 7x + 35)

D = x² - 10x + 25 - 2x² + 10x + 7x - 35

D = x² - 2x² - 10x + 10x + 7x + 25 - 35

D = - x² + 7x - 10

E = (3x + 1) (x - 2) - (2x - 3)²

E = 3x² - 6x + x - 2 - (4x² - 12x + 9)

E = 3x² - 6x + x - 2 - 4x² + 12x - 9

E = 3x² - 4x² - 6x + x + 12x - 2 - 9

E = - x² + 7x - 11.