Est ce que quelqu’un peut m’aider a faire sa svp en m’expliquant tout svp svp :)

Réponse :

ex 2

A = -x + 6x^2 - 1 - 4x + 8 + x^2

A = 7x^2 - 5x + 7

B = x^2 - 3x^2 - 11 - 4x + x + 3

B = -2x^2 - 3x - 8

ex 3

A = (-x + 6x^2) - (1 - 4x) + (8 - x^2)

A = -x + 6x^2 - 1 + 4x + 8 - x^2

A = 5x^2 + 3x + 7

ex 4

1 ) A = 4x(-3 + 2x)

A = -12x + 8x^2

B = (3x + 7)(2x + 3)

B = 6x^2 + 9x + 14x + 21

B = 6x^2 + 23x + 21

C = (2x - 5)(3x + 4)

C = 6x^2 + 8x - 15x - 20

C = 6x^2 - 7x - 20

D = -2(6x - 1) + (2x - 4)(3x + 2)

D = -12x + 2 + 6x^2 + 4x - 12x - 8

D = 6x^2 - 20x - 6