$$\left. \begin{array} { l } { F = ( 2 x + y ) ^ { 2 } ) + ( 2 y ) + ( 2 y - 4 x ) f } \\ { A ( 0 , 0 \right.$$
$x=\frac{-y-\sqrt{F}}{2}$
$x=\frac{-y+\sqrt{F}}{2}$
$x=\frac{-y-\sqrt{F}}{2}$
$x=\frac{-y+\sqrt{F}}{2}\text{, }F\geq 0$
