x=9log25.5log2-3log18 x=...

[tex]^9\log{25}=^{3^{2}}\log{5^{2}[/tex]
[tex]=\frac{1}{2}\times 2\times ^3\log{5}[/tex]
[tex]=^3\log{5}[/tex]

[tex]^9\log{25}\times ^5\log{2}-^3\log{18}[/tex]
[tex]=^3\log{5}\times ^5\log{2}-^3\log{18}[/tex]
[tex]=^3\log{2}-^3\log{18}[/tex]
[tex]=^3\log{\frac{2}{18}}[/tex]
[tex]=^3\log{3^{-2}}[/tex]
[tex]=-2[/tex]