jika f (x) x + 1 dan g (x) x² + 1 maka domain ( f + g) (x)

f(x) = x + 1
g(x) = x² + 1

(f + g)(x) = f(x) + g(x)
(f + g)(x) = x + 1 + x² + 1
(f + g)(x) = x² + x + 2