Which statement best describes how to determine whether f(x) = x4 – x3 is an even function? a) Determine whether (–x)4 – (–x)3 is equivalent to x4 – x3.
b) Determine whether (–x4) – (–x3) is equivalent to x4 x3.
c) Determine whether (–x)4 – (–x)3 is equivalent to –(x4 – x3).
d) Determine whether (–x4) – (–x3) is equivalent to –(x4 x3).