\(x^2\left(x-2\right)^2-\left(x-2\right)^2-x^2+1=\left(x-2\right)^2\left(x^2-1\right)-\left(x^2-1\right)=\left(x^2-1\right)\left(x^2-4x+4-1\right)=\left(x-1\right)\left(x+1\right)\left(x^2-4x+3\right)=\left(x-1\right)\left(x+1\right)\left(x-1\right)\left(x-3\right)\)

