I don't think so. I think they know that radical is square root in that case. I think they don't understand how to work with roots.
I think the main thing they should understand is that they need to factor the number inside the radical into primes and then find pairs of factors and pull them out (that's the best way I can explain it though not exactly how I would do it)
For example:
Radical[72]
Find prime factors
Radical[3*3*2*2*2]
Pull out factor pairs (they go from pairs inside the radical to single multipliers outside)
3*2*radical[2]
Simplify
6*radical[2]
If the OP does this process for all 3 terms they should see a way to further simplify.