It does not work that way.
A negative power is simply the reciprocal.
So that x-a = 1/xa
The reciprocal is negative or positive according to whether the number itself is negative or positive. [And, if the number is 0, the reciprocal is not defined.]
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Please consider the following two facts: A negative number to an even power is positive; but a negative number to an odd power is negative. Any positive number is greater than any negative number.
When a negative number is raised to an even power the result is a positive number
Yes. Any positive number to an exponent is positive.
The result will be a negative value.
A positive number. Positive Number x Positive Number = Positive Number Positive Number x Negative Number = Negative Number Negative Number x Negative Number = Positive Number