I'm sorry, but the equation is not complete so I can't provide an adequate response.
However, let me give you some information. f⁻¹(2) is the inverse function value. In other words, f⁻¹(2) = x means that f(x) = 2. So find a value of x that satisfies that equation and that's f⁻¹(2).
Ответ: Unknown
I believe in your capacity to figure things out! Continue your great work.