The function you've provided is:

$f(x) = \sqrt{x} - 3$

To solve this, we'll first clarify the possible meanings. If you're looking for the value of $f(x)$ for specific values of $x$, I can help with that. Alternatively, if you're trying to solve for $x$ when $f(x)$ is equal to a certain number, like solving $f(x) = 0$, let me know!

If you want to solve for $f(x) = 0$:

Set $f(x)$ equal to 0:

$\sqrt{x} - 3 = 0$

Now, solve for $x$:

1. Add 3 to both sides: $\sqrt{x} = 3$
2. Square both sides: $x = 9$

So, $x = 9$ is the solution when $f(x) = 0$.

If you want to know the function value for a specific $x$:

Just plug that $x$-value into the function.

Let me know if you'd like more details or have specific values to substitute for $x$!

Further Questions:

1. What is the domain of $f(x)$?
2. How would the graph of $f(x) = \sqrt{x} - 3$ look?
3. How does changing the constant in the function affect the graph?
4. How can you express this function in a different form?
5. Can you calculate $f(4)$?

Tip:

Remember that the square root function is defined only for non-negative numbers, so $x \geq 0$.