To get the inverse of an even power of a negative you should be able to
use something like.

=POWER(ABS(A1),1/2) where A1 is -100 the result is 10. Unfortunately,
that is not 100% accurate because 10 needs to be multiplied by -10.
This is due to the even number of times the number is multiplied by
itself.

If you are looking for odd powers then a negative is always returned.

=POWER(ABS(A1),1/3) where A1 is the negative number you are looking to
find the 3rd power of. So if A1 is -100 the result would be
-4.64158883361278 which raised to the 3rd power results in -100. Even
power analysis will always result in a positive.


Does that help?

Steve


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