Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test 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
More than one of the above
5
None of the above