Respuesta :

Answer:

see explanation

Step-by-step explanation:

If f(x) is an even function, then

f(x) = f(- x)

f(- x) = (- x)³ + 5(- x) + 1 = - x³ - 5x + 1 ≠ x³ + 5x + 1

Thus f(x) is not an even function