Question

let f(x) = x + 4 / 5. Find f^-1 (6)

Answer 1

That notation up there means we need to get the inverse of the function. In doing this, we first isolate x. And make the xs y and the ys x.

y=x+4
y-4=x
x-4=y
f-1(x) = x-4

f^-1(6) = 6-4=2.