You cannot be serious ... Just in case you are, it's 87.
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The square root of 87 is: ± 9.327379
2
Square root of 87 is 9.3. Which is rounded to the nearest tenth.
[square root (78)] squared = 78. There is not a surd from for an integer.
Do you mean: What is the square root of (8 squared)? If so, there are two answers: 8 and -8. Or do you mean: What is the (square root of 8) squared? If so, there is only one answer: 8.