Function or nah?

Nah

Step-by-step explanation:

Definition of a function:

a relation from a set of inputs to a set of possible outputs where each input is related to exactly one output!

According to this, i.e. you have multiple y for x = -2, -1, 0, 1, 2, 3, 4

step-by-step explanation:

to determine whether a given function is even, we simply substitute x with -x in the expression. if the result after simplification is identical to the original equation, then the function is said to be even other wise odd.

f(-x) = (-x)^2 - (-x) + 8

      = x^2 + x +8

the resulting function is not identical to the original one;

f(-x) ≠ f(x)

therefore, f(x) is not an even function