Chapter 12 - Exponential Functions and Logarithmic Functions - 12.4 Properties of Logarithmic Functions - 12.4 Exercise Set - Page 810: 37

$2\log_a w-2\log_ax+\log_ay$

Using the properties of logarithms, the given expression, $ \log_a(w^2x^{-2}y) ,$ is equivalent to \begin{array}{l}\require{cancel} \log_a w^2+\log_ax^{-2}+\log_ay \\\\= 2\log_a w-2\log_ax+\log_ay .\end{array}