Question

4- Dada a função f(x) = 8x + 4 a função inversa é:
a) y-1 = 8x - 4
b) y-1 = 8x + 4​

Answer 1

$\mathsf{f(x)=8x+4}\\\mathsf{8x=f(x)-4}\\\mathsf{x=\dfrac{f(x)-4}{8}}\\\huge\boxed{\boxed{\boxed{\boxed{\mathsf{f^{-1}(x)=\dfrac{x-4}{8}}}}}}$