x=8 nên x+1=9
\(D=x^{2024}-9x^{2023}+9x^{2022}-...+9x^2-9x-2023\)
\(=x^{2024}-x^{2023}\left(x+1\right)+x^{2022}\left(x+1\right)-...+x^2\left(x+1\right)-x\left(x+1\right)-2023\)
\(=x^{2024}-x^{2024}-x^{2023}+x^{2023}+x^{2022}-...+x^3+x^2-x^2-x-2023\)
=-x-2023
=-8-2023
=-2031