if f(x)=square root of x-4 what is f inverse

I came up with x^2+16

2 answers

Is f(x) = sqrt(x) - 4 or
is f(x) = sqrt(x - 4)?

If it's the first one then you're correct.
Wait, sorry, my mistake.

If it's the 2nd one then the answer should be x^2 + 4

The 1st one wouldn't be correct. as you would have (y+4)^2 = y^2 + 8y + 16
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