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Let f:[4, infty) to [1, infty) be a func...

Let `f:[4, infty) to [1, infty)` be a function defined by `f(x) = 5^(x(x-4))`, then `f^(-1)(x)` is

A

`2-sqrt(4+log_(5)^(x))`

B

`2+sqrt(4+log_(5)^(x))`

C

`(1/5)^(x(x-4))`

D

not defined

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The correct Answer is:
B
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