Which of the following functions must be subtracted from f (x) = 3x3 + 2x2 + 1 for the resulting function to be an odd function?
O a) g(x) = 3x3
Ob) g(x) = 2x2 + 1
O c) g(x) = -3x3
d) g (3C) = 3x3 + 1