Solve : $(\sqrt 3 x -2y)^2$

Question

$\begin{array}{1 1} 3x^2+4y^2 \\ 3x^2+4y^2-4xy \\ 3x^2+4y^2-\sqrt 3 xy \\ 3x^2+4y^2- 4 \sqrt 3 xy \end{array} $