Teaching RPSC School Lecturer Mock Test Series 2024 Mathematics Relations and Functions

Let f : [4, ∞) → [4, ∞) be defined by f(x) = 5x(x-4). Then, f-1(x) is 

1
\(2-\sqrt{4+\log _5 x}\)
2
\(2+\sqrt{4+\log _5 x}\)
3
\(\left(\frac{1}{5}\right)^{x(x-4)}\)
4
not defined
5
Question Not Attempted
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