\(x^3-4x^2-8x+8\)
\(=\left(x^3+8\right)-\left(4x^2+8x\right)\)
\(=\left(x^3+2^3\right)-\left(4x^2+8x\right)\)
\(=\left(x+2\right).\left(x^2-2x+4\right)-4x.\left(x+2\right)\)
\(=\left(x+2\right).\left(x^2-2x+4-4x\right)\)
\(=\left(x+2\right).\left(x^2-6x+4\right)\)
Chúc bạn học tốt!