Question

What is the inverse of the function f(x) = 4x + 8?

Answer 1

$f(x)=4x+8\\y=4x+8\\x=4y+8$

Proceed the inverse. Swap the x and y.

$x-8=4y\\\frac{x}{4}-\frac{8}{4}=y\\y=h(x)\\h(x)=\frac{x}{4}-2\\h(x)=\frac{1}{4}x-2$

So the answer is first one.