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Suppose the function f has all real numbers in its domain and range and is invertible. Some values of f are given by the following table: $$x12345f(x)23578$$What is the value of f(f(3))+f(f1(4))+f1(f1(5))? If there is not enough information to answer this question, enter "NEI".

 Nov 3, 2017
 #1
avatar+536 
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I think it is

 

3f^2+4+5/f^2

 

I hope!

 Nov 3, 2017
 #2
avatar+130466 
+3

f(f(3))+f(f1(4))+f1(f1(5))

 

f (3)  = 5

 

f(f(3))  = f (5)  = 8

 

And   f( f-1) (4))   =  4

 

And   f-1 ( f-1(5) )      =  f-1 (3)  =  2

 

 

 

So

 

8+ 4  + 2  =  14

 

 

CORRECTED  !!!!

 

 

cool cool cool

 Nov 3, 2017
edited by CPhill  Aug 8, 2022
edited by CPhill  Aug 8, 2022
edited by CPhill  Aug 8, 2022

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