To find f(2) substitute n by 2 in f(n)
[tex]f(2)=2^3+5(2)[/tex]Let us find its value
[tex]\begin{gathered} f(2)=8+10 \\ f(2)=18 \end{gathered}[/tex]To find g(2) substitute n by 2 in g(2)
[tex]g(2)=2(2)-3[/tex]Let us find its value
[tex]\begin{gathered} g(2)=4-3 \\ g(2)=1 \end{gathered}[/tex]Now let us add f(2) and g(2)
[tex]\begin{gathered} f(2)+g(2)=18+1 \\ f(2)+g(2)=19 \end{gathered}[/tex]