Write the general term in the expansion of $ (x^2 - yx)^{12},\; x\neq 0$

Question

$\begin{array}{1 1} -\;^{12} \large C_r\;x^{24-r} y^r \\-\;^{12} \large C_r\;x^{24-2r} y^r \\-\;^{12} \large C_r\;x^{12-r} y^r \\ -\;^{12} \large C_r\;x^{24-2r} y^{2r} \end{array} $