For this case we have the following definitions:
 A function is even if, for each x in the domain of f, f (- x) = f (x). The even functions have reflective symmetry through the y-axis.
 A function is odd if, for each x in the domain of f, f (- x) = - f (x). The odd functions have rotational symmetry of 180º with respect to the origin.
 We then have the following function:
 
 Applying the definitions we have:
 
 Answer:
 The function is not odd because it is fulfilled:

 Therefore, the function is even.