# Chapter 5 - Section 5.1 - Exponents and Scientific Notation - Exercise Set: 6

$\frac{z^{3}}{x^{7}}$

#### Work Step by Step

We are given the expression $\frac{x^{-7}}{z^{-3}}$. $\frac{x^{-7}}{z^{-3}}=\frac{z^{3}}{x^{7}}$ In general, $x^{−b}=\frac{1}{x^{b}}$ and $\frac{1}{x^{-b}}=x^{b}$, for some number x.

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