If we take function f(x)=x+5 then the inverse of f(x) is f(y)=y-5.
What is function?
A function is a relationship between two or more variables which is often solved to get the values of x . All value of x have some value of y.
It is different from equation as equation has only one or two values of x.
How to find inverse of function?
Let the function f(x)=x+5
The value of f(x) can be written as y
y=x+5
x=y-5
[tex]f^{-}[/tex](x)=y-5
Hence the inverse of function f(x) is y-5.
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