29-07-2016
Mathematics

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which function below is the inverse of f(x) = x^2-9

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29-07-2016

to find the inverse
replace f(x) with y
switch all x and y
solve for y
replace y with f⁻¹(x)

f(x)=x^2-9
y=x^2-9
x=y^2-9
x+9=y^2
sqrt both sides
[tex] \sqrt{x+9} [/tex]
replace
f⁻¹(x)=[tex] \sqrt{x+9} [/tex]

that is the inverse

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