Sagot :

Réponse:

1)

6x^2 - 15x + 8x - 20 = 6x^2 - 7 - 20

2)

A=4x^2 + 32x - 7x - 56 = 4x^2 + 25x - 56

B=-2x^2 - 4x + 3x + 6 = -2x^2 - x +6

C=-10x^2 - 5x + 4x + 2 = -10x^2 - x + 2

D=(3x-5) (3x-5) = 9x^2 - 15x + 15x + 25 = 9x^2 + 25