Determine the Possible Number of Positive Real Zeros and Negative $$f ( x ) = - 4 x ^ { 7 } - 9 x ^ { 6 } - 4.5 x ^ { 5 } + 3 x ^ { 4 } + x + 18$$

question 110

Multiple Choice

Determine the possible number of positive real zeros and negative real zeros of the polynomial function using Descartes' rule of signs.
- $$f ( x ) = - 4 x ^ { 7 } - 9 x ^ { 6 } - 4.5 x ^ { 5 } + 3 x ^ { 4 } + x + 18$$

• A)1 positive zero, 4, 3 or 1 negative zeros
• B)1 positive zero, 2 or 0 negative zeros
• C)1 positive zero, 3 or 1 negative zeros
• D)1 positive zero, 4 or 2 negative zeros

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