Répondre :
(8x+(-8))(4x+(-7)-(-5+9x)(3x+(-9)
(8x-8)(4x-7)-(-5+9x)(3x-9)
8x*4x+8x*(-7)-8*4x-8*(-7)+5*3x+5*(-9)-9x*3x-9x*(-9)
32x²-56x-32x+56+15x-45-27x²+81x
5x²+8x+11
(8x+(-8))(4x+(-7)-(-5+9x)(3x+(-9)
(8x-8)(4x-7)-(-5+9x)(3x-9)
8x*4x+8x*(-7)-8*4x-8*(-7)+5*3x+5*(-9)-9x*3x-9x*(-9)
32x²-56x-32x+56+15x-45-27x²+81x
5x²+8x+11