Formula

Property of Negative Exponents

The Property of Negative Exponents handles the case where a negative exponent appears in the denominator of a fraction. If nn is an integer and aeq0a eq 0, then:

1an=an\frac{1}{a^{-n}} = a^n

To see why, start with 1an\frac{1}{a^{-n}} and replace ana^{-n} with its definition 1an\frac{1}{a^n}. This produces the complex fraction 11an\frac{1}{\frac{1}{a^n}}. Simplify by multiplying: 1an1=an1 \cdot \frac{a^n}{1} = a^n. In other words, a base with a negative exponent in the denominator can be moved to the numerator by making the exponent positive.

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Updated 2026-04-29

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