\(C=\left(x+1\right)\left(x-1\right)\left(x^2+x+1\right)\left(x^2-x+1\right)\)
\(=\left[\left(x+1\right)\left(x^2-x+1\right)\right]\left[\left(x-1\right)\left(x^2+x+1\right)\right]\)
\(=\left(x^3+1\right)\left(x^3-1\right)\)
\(=\left(-3^3+1\right)\left(-3^3+1\right)\)
\(=728\)
C=728 bạn nhé
CHÚC BẠN LUÔN HỌC GIỎI !!!!