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When a number is raised to a negative power, in fraction form it would be described as one over that number and its exponent (positive). See below:
This is also how negative powers work when applied to units. The well known constituent units of the Newton (Force) kg*m/(s^2) could also be written as kg*m*s^-2, and so on. The negative exponent would represent the ‘per’, e.g. kilograms meters ‘per’ second squared.