It's the second...no hang on, it's the first...I could be wrong, but it might be the third...
It looks like my psychic abilities are failing me again, you'll have to list the radical expressions before I can answer for certain.
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A rational expression is an expression that contains a radical, i.e., a root.
Sqrt[5*radical(68)] = -6.4211 and +6.4211.
A radical number is a number with a decimal. so a radical expression would be like 5 raised to the 2.5 power.