[tex]\boxed {\boxed { \text {(f + g)(x) = f(x) + g(x)}}}[/tex]
[tex]f(x) = 2x - 5[/tex]
[tex]g(x) = x^2-4x -8[/tex]
[tex](f + g)(x) = 2x - 5 + x^2-4x -8[/tex]
[tex](f + g)(x) = x^2 - 2x - 13[/tex]
[tex]\boxed {\boxed { \text {Answer : }x^2 - 2x - 13}}[/tex]
