The expression \( \sqrt{-3} \) can be simplified using the concept of imaginary numbers. The square root of a negative number involves the imaginary unit \( i \), where \( i = \sqrt{-1} \).
To simplify \( \sqrt{-3} \):
\[ \sqrt{-3} = \sqrt{3} \cdot \sqrt{-1} = \sqrt{3} \cdot i \]
Therefore, in simplest radical form, \( \sqrt{-3} \) can be expressed as:
\[ \sqrt{-3} = i\sqrt{3} \]