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If \(f(x) = |3x - 1|,\) compute all values of \(x\) for which \(f(f(x)) = x.\) Enter all the solutions, separated by commas.

 Mar 20, 2019
 #1
avatar+19966 
+1

|9x-4|=x

 

so  9x -4 = +x       x = 1/2

or   9x-4 = -x        x = 2/5

 Mar 20, 2019
 #2
avatar+28236 
+3

You have found two of the possibilities EP.

 

 Mar 20, 2019
 #3
avatar+19966 
0

Thanx, Alan !   I see what I did incorrectly now.

ElectricPavlov  Mar 20, 2019
edited by ElectricPavlov  Mar 20, 2019

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