Question

assinale a função inversa de f(x)=7x-1 qual a resposta certa desta galera

Answer 1

$f(x)=7x-1\\\\ troca~f(x)~por~y..\\\\ y=7x-1\\\\ troca~y~por~x..\\\\ x=7y-1\\ 7y=x+1\\\\ y= \dfrac{x+1}{7}\\\\ y^{-1}= \dfrac{x}{7}+ \dfrac{1}{7}\\\\ y^{-1}=f(x)^{-1}\\\\\\ \Large\boxed{f(x)^{-1}= \dfrac{1}{7} x+ \dfrac{1}{7}}$

Answer 2

Ola Olivinha

y = 7x - 1

7x = y + 1

x = (y + 1)/7

f^1(x) = (x + 1)/7

.