Domain: The function
f(x) = x2 + 2
is defined for all real values of x (because there are no restrictions on the value of x).
Hence, the domain of `f(x)` is
"all real values of x".
Range: Since x2 is never negative, x2 + 2 is never less than `2`
Hence, the range of `f(x)` is
"all real numbers `f(x) ≥ 2`".
We can see that x can take any value in the graph, but the resulting y = f(x) values are greater than or equal to 2.