An exponent that is a positive integer. For example, x3 has a positive exponent, while 8-5 does not.
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any exponent greater than 0. like the 2 in 32, but not the -2
No.
Not necessarily. If the exponent is not an integer then it is not a polynomial.
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You can do it if you replace the base by its reciprocal.
Example: (4x)-2 The answer to this would be 1/ 16x2. Multiply it out as if the negative exponent was not there ((4x)2), then that will be the denominator of the fraction. The numerator is one.