Find the domain of the function $g$ where $g(x)={\sqrt{7+5x}}$. If you need to enter $\infty$, you can type inf or infinity. To enter the union of two (or more) intervals, use the letter U. For example, to enter $(-\infty,5)\cup(5,10]$ you can type $(-\text{inf},5)\text{U}(5,10]$.