Use Descartes' Rule of Signs to determine the possible number of positive real zeros and the possible number of negative real zeros for the function.f(x) = -4x4 - 6x3 - 6x2 - 9x + 9
A. 1 positive; 1 or 3 negative
B. 1 positive; 1 negative
C. 0 or 2 positive; 0 or 2 negative
D. 1 positive; 2 negative
Answer: A
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A. ?
B. ?
C. ?
D. 
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Sketch the graph of the function f and evaluate 
