Ta có: \(x^3+x^2-4x-4=\left(x^3+x^2\right)-\left(4x+4\right)\)
\(=x^2\left(x+1\right)-4\left(x+1\right)\)
\(=\left(x+1\right)\left(x^2-4\right)=\left(x+1\right)\left(x-2\right)\left(x+2\right)\)
x^3+x^2-4x-4=x^2(x+1)-4(x+1)=(x^2-4)(x+1)
chúc bạn làm bài tốt