Answer:
[tex]f(g(4)) = f(4^2-3) = f(13) = 13 + 7 = 20[/tex]
[tex]g(f(5)) = g(5 + 7) = g(12) = 12^2-3 = 141[/tex]
[tex]f(f(1)) = f(1 + 7) = f(8) = 8 + 7 = 15[/tex]
