Concept explainers
To find: The number of possible positive real zeros and the number of possible negative real zeros for
Answer to Problem 39E
There are 0 or 2 positive zeros
1 negative zero
Explanation of Solution
Given information:
Calculation:
r | -2 - 1 -28 15 | |
1 | 2 -3 -31 | -16 |
3 | 2 1 -25 | -60 |
5 | 2 5 -3 | 0 |
Descartes tell us there are 0 or 2 positive zeros and since
There is 1 negative zero.
Possible zeros are every factor of:
Testing integer values, we find that 5 is a zero, so
Factoring the quadratic we find:
With zeros of:
Chapter 4 Solutions
Advanced Mathematical Concepts: Precalculus with Applications, Student Edition
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