Use Descartes' Rule of Signs to determine the possible number of positive and negative zeros of f(x) = x5 + 2x.
A. 1 positive real; 3 negative reals or 1 negative real
B. no positive reals; no negative reals
C. 1 positive real; 5 negative reals or 3 negative reals or 1 negative real
D. 5 positive reals or 3 positive reals or 1 positive real; no negative reals
E. 3 positive reals or 1 positive real; 3 negative reals or 1 negative real
Answer: B
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