Riddles, brain puzzles and mathematical problems

[BAndrew]

@Froge

Correct!

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A more difficult version of this:

If

• f(3ax) / f(ax) = k
  

Then calculate

f(243x)/f(x)

It doesn't require any theorem or something like that. Just a basic knowledge of what a function is. The idea is the same with the previous problem (it depends on how you solved the previous riddle though).