Subtract $2x^3-x^2+4x-6 $ from $x^3+5x^2-4x$

Question

$\begin{array}{1 1} -x^3-6x^2+8x-12 \\ -x^3+6x^2-8x+12 \\ x^3+6x^2-8x+12 \\ x^3-6x^2+8x-12 \end{array} $