Question

Achar a express˜ao da fun¸c˜ao inversa de:

(a) f : R −→ R, com f(x) = 3x − 12.

(b) f : R − {4} −→ R − {2}, definida por g(x) = 2x − 5x − 4​

Answer 1

1. Inverter as variáveis
2. Isolar y

$y=3x-12\\\\x=3y-12\\\\y=\frac{x+12}{3}$

$y=3x-5x-4\\\\x=3y-5y-4\\\\x=-2y-4\\\\2y=-4-x\\\\y=\frac{-4-x}{2}$