sqr(-30) is i*sqr(30)
We use i to represent the sqr(-1) because it is called an imaginary number. It takes an imagination to work with it. It is not fictitious.
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30*30
The square root of 30 is: ± 5.477226
√15/√30 = √(15/30) = √(1/2)
It is equal to: 2 times the square root of 30
173.205081