Answer
See the verification below.
Work Step by Step
The functions $f(x)$ and $g(x)$ are known as inverse functions. Thus, we simplify
$(f\circ g) (x)=(g\circ f) (x)$ or, $f[g(x)]=g[f(x)]$
as follows:
$(f\circ g) (x) =f[g(x)]=f(x-5)=x-5+5 =x$
and
$(g\circ f) (x) = g[f(x)]=g(x+5)= x+5-5=x$
Hence, verified.
