exam Maths Puzzle Numerical Ability

Could someone help me with this one please. If you do not mind would you show me step by step how you came upon the answer? Thank you
Solve (x-5)^2=6

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Question 72 on page 63
Represent each quantity with a real number.
A country exported $60,000,000 less than it imported, creating a negative balance.
Please help; the directions are to verify the identity or something. You will know if your final answers are correct because you should end with the same expression on each side of