The graph of $f(x)=\sqrt{x}$ is sketched in red and the graph of $g(x)$ is sketched in green (click on the graph to see an enlarged image). Use the translation rule and $f(x)=\sqrt{x}$ to identify the function $g(x)$;

$g(x)=$ You may use sqrt(.) for $\sqrt{.}$, e.g. write sqrt(5) for $\sqrt{5}$.