[tex] log_{5}(9) - 2 log_{5}(3) + log_{5}(1) [/tex]
[tex] log_{5}(9) - 2 log_{5}(3) + 0[/tex]
[tex] log_{5}( {3}^{2} ) - 2 log_{5}(3) [/tex]
[tex]2 log_{5}(3) - 2 log_{5}(3) [/tex]
S=0