To simplify the expression \(3^9 \div 3^7\) using the Quotient Rule of Exponents, we can apply the rule which states that \(a^m \div a^n = a^{m-n}\).
In this case:
- \(a = 3\)
- \(m = 9\)
- \(n = 7\)
Applying the rule:
\[ 3^9 \div 3^7 = 3^{9-7} = 3^2 \]
Thus, the exponent in the exponential simplest form is \(2\).