[ 2 minus square root of 5 ] is the only one.
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Nothing. You cannot have a square root of a negative number. The square root of negative one is called i, but i is an imaginary number. It does not exist and does not follow the properties of real numbers. (For example, if a and b are positive, then the square root of a times the square root of b is the square root of ab. But the square root of -7 is not the square root of 7 times i.)
They are the complex conjugate numbers +/- 3*sqrt(2)*i where i is the imaginary square root of -1.
square root of 27 plus the square root of 75
Since infinity is not a defined number, it is impossible to have a square root of it. its infinity!
The complex conjugate pair:8.5 - 6.837iand8.5 + 6.837iwhere i is the imaginary square root of -1.