What is the domain of the function f given by f(x)=sqrt x^2-4/x-3?

Question:Consider the graph of function f.[tex]f\left(x\right)=\sqrt{x-4}-1[/tex]( graph in photo below )What is the domain of function f?Answer:[tex]\left(4,\ \infty\right)[/tex]Explanation:( In photo below )