+0  
 
+1
91
2
avatar+809 

Given that f(3)=5 and \(f(3x)=f(x)+2\)  for all x, find \(f^{-1}(11)\).

 Aug 27, 2018
 #1
avatar
+1

The answer is 81

you can see every time we multiply x by 3, the y goes up by 2

so 11-5=6

6/2=3

3^1*3^3=3^4=81

 Aug 27, 2018
 #2
avatar
+2

(This question a little chanellge to me. Difinitely fun!)

The first anwser is right,but I think my anwser is more specific.

given f(3)=5 

f(9)=f(3)+2=5+2=7

f(27)=f(9)+2=7+2=9

f(81)=f(27)+2=9+2=11

\({f}^{-1}(11)={f}^{-1}(f(81))=81\)

.
 Aug 27, 2018

22 Online Users

avatar
avatar
avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.