Développe et réduis chaque expression : I=3x+5x(4-2x)-2(x au carré -3x +5) J=8+2x-2x(3x-4)+5x(3-x)

I=3x+5x(4-2x)-2(x²-3x+5)
  =3x+20x-10x²-2x²+6x-10
  =-12x²+29x-10

J=8+2x-2x(3x-4)+5x(3-x)
  =8+2x-6x²+8x+15x-5x²
  =-11x²+25x+8

Bonjour

3X+5X (4-2X)-2(X²-3X+5)
3X+20X-10X²-2X²+6X-10
-10X²-2X²+20X+3X+6X-10
-12X²+29X-10

8+2X-2X(3X-4)+5X (3-X)
8+2X-6x²+8X+15X-5X²
-6X²-5X²+2X+8X+15X+8
-11X²+25X+8