Question

rewrite $9^{-3}$ using a positive exponent.
how can you rewrite the expression using a positive power of 9?
$9^{-3}=\frac{1}{9^{3}}$
if $n$ is any integer, what is another way to write $9^{-n}$?
$9^{-n}=$ ?

Explanation:

Step1: Recall negative exponent rule

For any non-zero base $a$ and integer $n$, $a^{-n} = \frac{1}{a^n}$.

Step2: Apply rule to $9^{-n}$

Substitute $a=9$ into the rule.

Answer:

$9^{-n} = \frac{1}{9^n}$