It looks like you're trying to solve an inequality involving square roots. Let's break it down step by step.

The expression you've written seems to be \( \sqrt{x} - 3 < 0 \).

To solve this inequality, we can isolate \( \sqrt{x} \):

1. Start by adding 3 to both sides of the inequality:
\[
\sqrt{x} < 3
\]

2. Next, square both sides to eliminate the square root (note that when you square both sides, the direction of the inequality remains the same because both sides are non-negative):
\[
x < 3^2
\]
\[
x < 9
\]

Now, since \( \sqrt{x} \) is defined only for non-negative values of \( x \), we also need to consider \( x \geq 0 \).

So, the solution to the inequality is:
\[
0 \leq x < 9
\]

In interval notation, this can be expressed as:
\[
[0, 9)
\]

If you meant something else or have additional questions, please clarify!