book Maths Puzzle Numerical Ability

Simplify:
sqrt 15/24y^5
I don't understand these sort of problems.

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book Other Question

Express irrational solutions in simplest radical form.

N^2-6=0 Would this be (+-)Sqrt 5?

(n-5)^2=20 Would this be (+-)2*Sqrt 5? 3h-5(2h+4)=4h+2