Final answer:
To determine (f+g)(x), the two functions f(x) and g(x) are added together to yield the final function x^2 - x + 6.
Step-by-step explanation:
To find the function (f+g)(x), we need to add the functions f(x) and g(x) together. Given that f(x) = x^2 + 1 and g(x) = 5 - x, we can combine them like this:
(f+g)(x) = f(x) + g(x)
= (x^2 + 1) + (5 - x)
= x^2 + 1 + 5 - x
= x^2 - x + 6.
Therefore, the correct option is x^2 - x + 6.