Question

F(x)=5x-8/3, obtenha F-1 (xl

Answer 1

Faça assim:

f(x) = y

$y=\frac{5x-8}{3}\\ \\ troque \ x \ por \ y:\\ \\ x=\frac{5y-8}{3}\\ \\ Isole \ y:\\ \\ 5y-8=3x\\ \\ 5y=3x+8\\ \\ y=\frac{3x+8}{5}\\ \\ f^{-1}(x)=\frac{3x+8}{5}$