A horizontal shift of k units to the right means the value of x will decrease by k units.
If the function was translated 8 units right, the value of x will decrease 8 units:
[tex]x^{\prime}=x-8[/tex]So the new function will be:
[tex]\begin{gathered} F(x)=\sqrt{x}\\ \\ G(x)=F(^x^{\prime})=F(x-8)=\sqrt{x-8} \end{gathered}[/tex]