Répondre :
A = (x-1)(-5x+2)
=-5x²+2x+5x-2
=-5x²+7x-2
B = x(-5x+5)+2(x-1)
=-5x²+5x+2x-2
=-5x²+7x-2
C = -5x(x-2)-(3x+2)
=-5x²+10x-3x-2
=-5x²+7x-2
=-5x²+2x+5x-2
=-5x²+7x-2
B = x(-5x+5)+2(x-1)
=-5x²+5x+2x-2
=-5x²+7x-2
C = -5x(x-2)-(3x+2)
=-5x²+10x-3x-2
=-5x²+7x-2