If f and g are inverse functions, f (7) =10 and f (10) = −1 , find g(10).

Answer 1

Inverse function has one peculiar property:

if g is the inverse function of f, and the domain of both is (-∞,∞), then
f(g(x))=x
and inversely
g(f(x))=x

From information above, what would g(f(7)) give?