## Finite Math and Applied Calculus (6th Edition)

$\displaystyle \frac{3}{x^{4}}$
Use: $a^{-n}=\displaystyle \frac{1}{a^{n}}$ $3x^{-4}=3\displaystyle \cdot\frac{1}{x^{4}}=\frac{3}{x^{4}}$