Which statement best describes how to determine whether fx=x2-x+8 is an even function? Determine whether -x2--x+8 is equivalent to x2-x+8 Determine whether -x2--x+8 is equivalent to x2-x+8 Determine whether -x2--x+8 is equivalent to -x2-x+8 Determine whether -x2--x+8 is equivalent to -x2-x+8