Use Descartes's Rule of Signs to determine the possible number of positive and negative real zeros for the given function.f(x) = x5 - 2.7x4 - 18.71x3 + 3x2 + 38.88x - 9.791
A. 3 or 1 positive zeros, 2 or 0 negative zeros
B. 2 or 0 positive zeros, 3 or 1 negative zeros
C. 3 or 1 positive zeros, 3 or 1 negative zeros
D. 2 or 0 positive zeros, 2 or 0 negative zeros
Answer: A
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B. 742
C. 53 
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A. (-2, 0), (2, 0), (0, -4), (0, 4)
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D. (-4, 0), (4, 0), (0, -8), (0, 8)