Question

If f(x) = 3x +3, which of the following is the inverse of
f(x)?

Answer 1

Answer: $f^{-1}(x)=\frac{x-3}{3}$

Step-by-step explanation:

Let $f(y)=x$

$x=3y+3\\\\x-3=3y\\\\y=\frac{x-3}{3}\\\\\therefore f^{-1}(x)=\frac{x-3}{3}$