book Maths Puzzle Numerical Ability

I would really appreciate it if someone could solve and explain this problem for me-
reduce to a radical having integral radicands.
radical sign then 1/2

- Thanks so much!

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book Other Question
how do you do this problem? Here is another one I can't figure out as well. The point (1,2) has the distance ? from the line defined by {{{y=-(x/3)+1}}}