Use Descartes's Rule of Signs to determine the possible number of positive and negative real zeros for the given function.f(x) = x5 - 3.2x4 - 19.58x3 + 3x2 + 49.21x - 13.538
A. 2 or 0 positive zeros, 3 or 1 negative zeros
B. 2 or 0 positive zeros, 2 or 0 negative zeros
C. 3 or 1 positive zeros, 2 or 0 negative zeros
D. 3 or 1 positive zeros, 3 or 1 negative zeros
Answer: C
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