Question

f(x)=3x-1 g(x)=x^2+1 find (f+g)(3)

Answer 1

Answer:

$f(x) = 3x - 1 \\ g(x) = {x}^{2} + 1 \\ (f + g)(x) ={ x}^{2} + 1 + 3x - 1 \\ (f + g)(x) ={ x}^{2} + 3x \\ (f + g)(3) ={ 3}^{2} + 3(3) = 9 + 9 \\ \boxed{(f + g)(3) =18}$