Question

I don't got this one @Yttrium

Answer 1

Domain : all possible values of x u can plugin into the function

Answer 2

\(f(x) = \frac{1}{2}x^2 + 2\)

Are there any bad-values you cannot plugin for x ?

Answer 3

nope.
u can plugin any value for x. so the domain is all real values : (-inf, +inf)