## Algebra: A Combined Approach (4th Edition)

Because 1 is always being divided by $x^{n}$ if it equates to a number other than 0 or 1.
Eg) $\frac{1}{x^{n}}$ where $x$=5 and $n$= 2 equates to $\frac{1}{25}$ which equals $0.04$ and $0.04\ne0$