To apply the Property of Negative Integer Exponents, we need to convert any negative exponents in the expression to positive ones. The property states that \( a^{-n} = \frac{1}{a^n} \).
Let's start with the expression:
\[ 5^{-9}4^{-12} \]
We can apply the property to each term:
- For \( 5^{-9} \):
\[ 5^{-9} = \frac{1}{5^9} \]
- For \( 4^{-12} \):
\[ 4^{-12} = \frac{1}{4^{12}} \]
Now we can combine these two results:
\[ 5^{-9}4^{-12} = \frac{1}{5^9} \cdot \frac{1}{4^{12}} = \frac{1}{5^9 \cdot 4^{12}} \]
So, the expression with positive exponents only is:
\[ \frac{1}{5^9 \cdot 4^{12}} \]