The given function:
f(x) = x - 3
[tex](f\circ f)\text{ = f(f(x))}[/tex]Substitute x = f(x) in the expression:
[tex]\begin{gathered} (f\circ f)\text{ = f(f(x))} \\ (f\circ f)\text{ =f(x-3)} \\ (f\circ f)\text{ =(x}-3)-3 \\ (f\circ f)\text{ =x}-3-3 \\ (f\circ f)\text{ =x}-6 \end{gathered}[/tex]For
[tex](f\circ f)(10)[/tex]Substitute x = 10 in the expression of (fof)
[tex]\begin{gathered} (f\circ f)(x)=x-6 \\ (f\circ f)(x)=10-6 \\ (f\circ f)(x)=4 \end{gathered}[/tex]Answer: (fof)(10)
