1. ## Domain

Find domain of g(x)=√(7+9x).

2. Originally Posted by Tiger
Find domain of g(x)=√(7+9x).
the domain of $\displaystyle \sqrt {f(x)}$ is given by $\displaystyle f(x) \ge 0$

That is, the domain is the set of all real numbers $x$ such that $\displaystyle f(x) \ge 0$

then you can write that using any notation you please