Question 1028712
We will use this 3 properties 1)log_a (x×y) = log_a(x) + log_a (y)
                              2)log_a (x/y) = log_a (x) - log_a(y)
                              3)log_a(x^y) = y×log_a(x)

Therefore log_a ((y^2/(x^2×sqrt(z)) = log_a(y^2) - (log_a(x^2×sqrt(z)) (p.2)
                                    = log_a(y^2) - (log_a(x^2) +log_a(sqrt(z)) (p.1)
                                    =2×log_a(y) -(2×log_a(x) +log_a(z)/2)       (p.3)
 Replacing: 2×4 - (2×2 +6/2) =8 - 7 = 1

(Obs: sqrt(z) =z^(1/2) )