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Consider f: R+ -> [4, oo) given by f(x)=...

Consider `f: R_+ -> [4, oo)` given by `f(x)=x^2+4`. Show that f is invertible with the inverse `f^(-1)`of given f by `f^(-1)(y)=sqrt(y-4)` where `R_+`is the set of all non-negative real numbers.

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`f: R_+ -> [4, oo)` given by `f(x)=x^2+4`.
For one-one:
Let `f(x)=f(y)`
`implies x^2+4=y^2+4`
`implies x^2 =y^2`
`implies x=y`
`therefore f` is a one -one function.
For onto:
...
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