An equation of the form \(\displaystyle{y}={a}\cdot{b}^{{x}}\) represent exponential growth when b>1 and represents exponential decay when b>1.
\(\displaystyle{y}={\left({3}^{{x}}\right)}^{{2}}={\left({3}^{{2}}\right)}^{{x}}={9}^{{x}}\)

Since 9>1, \(\displaystyle{y}={\left({3}^{{x}}\right)}^{{2}}={9}^{{x}}\) represent exponential growth.

Since 9>1, \(\displaystyle{y}={\left({3}^{{x}}\right)}^{{2}}={9}^{{x}}\) represent exponential growth.