Répondre :
7x-3
-2x-10
18x^2+12x +12x +8 = 18x^2 + 24x +8
9x^2+6x+12x+8 = 9x^2 + 18x +8
-20x^2+10x+24x-12= -20x^2 +34x -12
4x^2-8x-8x+16 = 4x^2 -16x +16 voilà :)
-2x-10
18x^2+12x +12x +8 = 18x^2 + 24x +8
9x^2+6x+12x+8 = 9x^2 + 18x +8
-20x^2+10x+24x-12= -20x^2 +34x -12
4x^2-8x-8x+16 = 4x^2 -16x +16 voilà :)