Question

If f : Q → Q is defined as f (x) = x2 , then f^-1 (-9) =

Answer 1

Answer:

given that..

f(x)=x^2

let f^-1(x)=k

then x=f(k)

then x=k^2

then k=√x

therefore f^-1(x) =√x

f^-1(-9)= √-9= 3i