To simplify the radical \(\sqrt{170}\), we can start by factoring 170 into its prime factors:
\[ 170 = 2 \times 85 = 2 \times 5 \times 17 \]
Since none of the prime factors have a pair (as they are all raised to the first power), \(\sqrt{170}\) cannot be simplified further. Therefore, the simplified form of \(\sqrt{170}\) remains:
\[ \sqrt{170} \]
If you want a decimal approximation, \(\sqrt{170} \approx 13.0384\).