Jika a>0 dan a tidak samadengan 1 maka a log 9 - a log 27^2 + a log 81 =

[tex] ^a log(3^2) - ^a log(3^6) + a log(3^4) = 2(^a log(3))-6(^a log(3))+4(^a log(3)) [/tex]
[tex] ^a log(3^2) - ^a log(3^6) + a log(3^4) = 0 [/tex]
[tex] \therefore a \in \mathbb{R}, 0<a , a \neq 1 [/tex]