(1-2x)(4x^2+2x+1)=8(1-x^2)(x+2)

(1-2x)(4x²+2x+1)-8(1-x²)(x+2)4x²+2x+1-8x³-4x²-2x=8x-8x³+16-16x²16x²-8x-15=0   D=1024x₁=5/4   x₂=-3/4.