That depends on where the parentheses are in the question.
The square root of [ 27 - sqrt(12) ] is 4.8514 . (rounded)
sqrt(27) - sqrt(12) = 1.7321 . (rounded)
To get somewhat fancier about it . . .
sqrt(27) = 3 sqrt(3)
sqrt(12) = 2 sqrt(3)
sqrt(27) - sqrt(12) = sqrt(3) times (3 - 2) = 1 sqrt(3) = 1.732 (rounded)
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The numbers are: 6 plus square root of 27 and 6 minus square root of 27
The numbers are: (-12+square root of 171) and (-12-square root of 171)
square root of 27 plus the square root of 75
So I assume you mean the square root and square root of 27=square root of (9x3)=3(square root (3))
The square root of 27 is 9 root 3.