Given [tex]f(x)=x^2-4x[/tex] , [tex]x\in R[/tex] , [tex]|x|\leq 1[/tex](adsbygoogle = window.adsbygoogle || []).push({});

so f(x) is a one to one function , and i am supposed to find its inverse .

and i found :

[tex]f^{-1}(x)=2\pm \sqrt{4+x}[/tex]

this is weird since a single input would give 2 different outputs and it cant be considered a function . But f(x) is a one-one function , so it should have an inverse ?

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# Homework Help: F(x) function help

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