[tex]h(n) - g(n) = (n+2)-(2n + 1) = n + 2 - 2n -1 = -n + 1[/tex]
Hope that helped!
[tex]\\ \rm\rightarrowtail h(n)-g(n)[/tex]
[tex]\\ \rm\rightarrowtail n+2-2n-1[/tex]
[tex]\\ \rm\rightarrowtail n-2n+2-1[/tex]
[tex]\\ \rm\rightarrowtail 1-n[/tex]
