Answer:
The choice B.
[tex]f ^{ - 1} (x) = \frac{1}{3} {x}^{2} [/tex]
Answer: B
Step-by-step explanation:
[tex]f(x)=y=\sqrt{3x} \\\\x=\sqrt{3y} \ exchanging\ x\ and\ y\\\\Finding\ y\\\\x^2=3y\\\\f^{-1}(x)=y=\dfrac{x^2}{3}[/tex]
Answer B
