a) \(x^3-4x^2+5x-2=x^3-2x^2+x-2x^2+4x-2\)
\(=x\left(x^2-2x+1\right)-2\left(x^2-2x+1\right)=\left(x-2\right)\left(x^2-2x+1\right)\)
\(=\left(x-2\right)\left(x-1\right)^2=\left(x-2\right)\left(x-1\right)\left(x-1\right)\)
b) \(x^3+2x^2-x+2\) (câu này hình như đề sai)