Répondre :
7x-35-(9x-2x²-45+10x)
=7x-35-9x+2x²+45-10x
=2x²-12x+10
4x²-12x+9+2x²+2x-3x-3
=6x²-13x+6
5x+5-x²-x-(x²-10x+25)
=5x+5-x²-x-x²+10x-25
=-2x²+14x-20
SVP aidez moi:
7(x-5)-(x-5)(9-2x)=
(2x-3)²+(2x-3)(x+1)=
(5-x)(x+1)-(5-x)²=
7x-35-(9x-2x²-45+10x)
=7x-35-9x+2x²+45-10x
=2x²-12x+10
4x²-12x+9+2x²+2x-3x-3
=6x²-13x+6
5x+5-x²-x-(x²-10x+25)
=5x+5-x²-x-x²+10x-25
=-2x²+14x-20