Which statement best describes how to determine wether f(x)=x^3 +5x+1 is an even function
O determine whether -(x³+5x+1) is equivalent to x³ + 5x + 1
O determine whether (-x)³+5(-x)+1 is equaivalent to x³ + 5x + 1
O determine whether -x³+5x+1 is equaivalent to x³ + 5x + 1
O determine whether (-x)³+5(-x)+1 is equaivalent to x³ + 5x + 1