It is an irrational number, and therefore a real number.
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Square root of 40 approximately = 6.324555325 / square root of 40 = 0.790569415
NO!!! '40' is the square root of '1600' The square root of '600' is 24.49489743...
No - remember that you cannot have a negative square root. Instead, the square root should be +40 as opposed to -40.
The square root of 1600 is 40, therefore the square root of -1600 is 40i, where "i" is the imaginary unit.
sqrt(40) = 6.32455532 sqrt(20) = 4.47213595