Correct. The product property has been used to write the logarithm of a product as a sum of logarithms. To simplify $\displaystyle{\log}_{{3}}{9}\usepackage{cmbright}\Huge\$ , note that $\displaystyle{9}={{3}}^{{2}}\usepackage{cmbright}\Huge\$ . Using the definition of logarithm, $\displaystyle{\log}_{{3}}{9}={2}\usepackage{cmbright}\Huge\$ , which is the value of the question mark.