I know, Its Geometrically Possible

$E(5,3)$ and $F(2,-1)$ are two vertices of a square $EFGH$ , $H$ is the only point located on the x-axis. Find the coordinates of G and H.

NB: The points $E$ , $F$ , $G$ and $H$ are in succession

Express your answer as the algebraic sum of the coordinates of $G$ and $H$