Question

for f(x)=x+10

(fof^-1)(10)

Answer 1

It's been a long time since I have worked with them; but here's my solution:

f(x) = x + 10 => x = f(x) - 10 => f(x)^-1 = x - 10

fof^-1(x) = x - 10 + 10 = x

fof^-1 (10) = 10