
Concept explainers
To find:how many positive and how many negative real zeros the polynomial have using Descartes’s rule of sign and determine the possible total number of real zeros.

Answer to Problem 69E
The polynomial has either two or 0 positive and0 negative zeros and total number ofeither two or 0real zeros .
Explanation of Solution
Given information:
The polynomial is
Concept used: Descartes’s rule of signs:
Let P be a polynomial with real coef?cients.
1. The number of positive real zeros of
2. The number of negative real zeros of
Calculation:
The polynomial has two variation in sign, so it has either two or 0 positive zeros, now
So,
Thus,
Chapter 3 Solutions
Precalculus: Mathematics for Calculus - 6th Edition
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