To find g⁻¹(x), switch the places of x and y. Rearrange the equation so that it is equal to y.
g(x) = 1/(x + 4)
x = 1/(y + 4)
x(y + 4) = (1/(y + 4))(y + 4)
x(y + 4) = 1
(x(y + 4))/x = 1/x
y + 4 = 1/x
y + 4 - 4 = 1/x - 4
y = 1/x - 4
g⁻¹(x) = 1/x - 4
For the domain, you need to look at where x is located in the equation. For this equation, x is in the denominator by itself. A fraction cannot have a denominator of 0. This means that x cannot be equal to 0. The domain is:
