Concept explainers
a.
Find the real zeros of the function
a.
Answer to Problem 68E
Explanation of Solution
Given:
Function:
Calculation for graph:
Consider
Values of x | Values of f (x) |
0 | -18 |
1 | -102 |
-1 | -44 |
2 | -146 |
-2 | -330 |
By taking different values of x, the graph can be plotted.
Graph:
Interpretation:
By observing graph, it is clear that the curve of the function meets x-axis at
Hence, the real zeros of the function are
Conclusion:
Therefore, the real zeros of given polynomial function are
b.
By using real zeros of the function
b.
Answer to Problem 68E
Explanation of Solution
Given:
Function:
Calculation:
From above answer, the real zeros of function are
Now divide given function with above zero.
Using synthetic division,
So, quotient is
So,
To find other zeros, put
The above polynomial equation is a quadratic equation.
The zeros of a quadratic equation
Applying above formula,
Conclusion:
Therefore, the zeros of given polynomial function are
Chapter 2 Solutions
Precalculus with Limits: A Graphing Approach
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