Answer
$\frac{1}{49}$
Work Step by Step
The negative exponent rule states that for every nonzero number $a$ and integer $n$, $a^{-n}=\frac{1}{a^n}$ We use this rule to rewrite the given expression as $\frac{1}{7^2}$.
We expand the exponent on the denominator: $\frac{1}{7\times7}=\frac{1}{49}$
