bonjour pouvez-vous m'aider svp

Bonjour,

A = (x + 3)(x + 2)

= x^2 + 2x + 3x + 6

= x^2 + 5x + 6

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

= 2x^2 + 4x - 6x - 12

= 2x^2 - 2x - 12

C = (x - 7)(x + 9)

= x^2 + 9x - 7x - 63

= x^2 + 2x - 63

D = (x - 3)(4 - x)

= 4x - x^2 - 12 + 3x

= x^2 + 7x - 12

E = (3x + 4)(5x - 7)

= 15x^2 - 21x +20x - 28

= 15x^2 - 1x - 28

F = (-2x + 8)(4 - x)

= - 8x + 2x^2 + 32 - 8x

= 2x^2 - 16x + 32

J'espère t'avoir aidé.