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Logarithms Function*

This question is really confusing me:
 
If f(x) = 3x-2, Find f(log3a) for a>0
 
Step-By-Step would be greatly appreciated!
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1 Answer

 f(x ) = 3 X -2
 
  f( X ) = 3X / 9  = 1/9 ( 3X ) 
 
 f ( log3 a ) = 1/9 ( 3 log3a )