Witch statement best describes how to determine whether f (x) = x^3+5x+1 is an even function?

A. Determine whether - (x3 + 5x + 1) is equivalent to x3 + 5x + 1. b. Determine whether (-x) 3 + 5 (-x) + 1 is equivalent to x3 + 5x + 1.

c. Determine whether - x3 + 5x + 1 is equivalent to - (x3 + 5x + 1).

d. Determine whether (-x) 3 + 5 (-x) + 1 is equivalent to - (x3 + 5x + 1)

A function is even if f (x) = f (-x) for all x.

f (-x) = - x³ + 5 (-x) + 1

f (-x) = - x³ - 5x + 1

b. Determine whether (-x) 3 + 5 (-x) + 1 is equivalent to x3 + 5x + 1.