Simple...
you have: \(\sqrt{120}\)
The best you can do here is simplify the root--->>
You must find a number that is a perfect square--->>
\(\sqrt{4} * \sqrt{30} = \sqrt{120}\)
As we know 4 is a perfect root \(( \sqrt{4} =2)\) leaving you with....
\(2 \sqrt{30}\)
Thus, your answer.