Inverse of a function?

Question

If f(x) = √(3-x)

Also, are there any domain restrictions?

Answer 1

y = √(3-x)

x=√(3-y)

square both sides

x^2  = 3-y

x^2 -3 = -y

-x^2 +3 = y

no domain restrictions, but range: y limited, y< and equal to 3