Respuesta :

f(x) = 1/9x+2

-2 from both sides

f(x)-2 = 1/9x

*2 to both sides

9(f(x)-2) = x

replace 'f(x)' with 'x'

9(x-2) = f(x^-1)

simplify and reverse sides

f(x)^-1 = 9x-18

Answer:

[tex]f^{-1}(x)=9x-18[/tex]

Step-by-step explanation:

we have

[tex]f(x)=\frac{1}{9}x+2[/tex]

Let

[tex]y=f(x)[/tex]

[tex]y=\frac{1}{9}x+2[/tex]

Exchange variables x for y and y for x

[tex]x=\frac{1}{9}y+2[/tex]

Isolate the variable y

[tex]x-2=\frac{1}{9}y[/tex]

[tex]y=9(x-2)[/tex]

[tex]y=9x-18[/tex]

Let

[tex]f^{-1}(x)=y[/tex]

[tex]f^{-1}(x)=9x-18[/tex] -------> inverse function

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