Réponse:
bonsoir
Explications étape par étape:
A=-5x(2x-7)-x(3-x)+(-6x²+1)
=-5x×2x-5x×-7-x×3-x×-x-6x²+1
=-10x²+35x-3x+x²-6x²+1
=-10x²-6x²+x²+35x-3x+1
A =-15x²+32x+1
B=(-4x+9)×(-3x)-(11x²+8x-4)
=-4x×-3x+9×-3x-11x²-8x+4
=12x²-27x-11x²-8x+4
=12x²-11x²-27x-8x+4
B=x²-35x+4
