Posted by Miley on Friday, March 7, 2008 at 5:48pm.
Because -81^3 is a negative number. If you take a 1/4 root of any negative number (which is the same thing as taking a square root twice), you get imaginary or complex (real + imaginary) numbers.
the third power of -81 is a negative number
you can not take a square root of a negative number and get a real number.
(1/4) power is square root of square root.
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