descartes s rule of signs to determine the possible numbers of positive

Use Descartes’s Rule of Signs to determine the possible numbers of positive and negative zeros of the function.
f(x) = 6×3 + 3×2 – x + 6
The number of variations in sign inf(x) is . Therefore, the number of real zeros off is .
The number of variations in sign inf(-x) is . Therefore, the number of real zeros off is .
 
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