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If f(x)=|3x1|, compute all values of x for which f(f(x))=x. Enter all the solutions, separated by commas.

 Mar 20, 2019
 #1
avatar+37165 
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|9x-4|=x

 

so  9x -4 = +x       x = 1/2

or   9x-4 = -x        x = 2/5

 Mar 20, 2019
 #2
avatar+33654 
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You have found two of the possibilities EP.

 

 Mar 20, 2019
 #3
avatar+37165 
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Thanx, Alan !   I see what I did incorrectly now.

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

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