book Maths Puzzle Numerical Ability

hello,
this problem is driving me crazy. It is,in paranthesis, (3 sqrt 5)^5
Could you please show me how it is worked?
Thank you

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book Other Question

Give the coordinates of a point on a coordinate grid that is a distance of the square root of 5 from point 1,3. Is there a formula to find the answer and how do you work out this problem?
Thank you 2x-(-34)=16