## Functions Modeling Change: A Preparation for Calculus, 5th Edition

$\pm 2$
Use the fact that $\log 10^a=a$ and the fact that $10000=10^4$ to rewrite the expression as $\sqrt{\log 10000}=\sqrt{\log 10^4}=\sqrt{4}$. Since $\sqrt{4}=\pm 2$, the expression simplifies to $\pm 2$.