Which statement best describes how to determine whether f(x) = x2 – x + 8 is an even function? determine whether –x2 – (–x) + 8 is equivalent to x2 – x + 8. determine whether (–x)2 – (–x) + 8 is equivalent to x2 – x + 8. determine whether –x2 – (–x) + 8 is equivalent to –(x2 – x + 8). determine whether (–x)2 – (–x) + 8 is equivalent to –(x2 – x + 8).