
Concept explainers
Find the zeros of the function

Answer to Problem 33E
Explanation of Solution
Given:
Function:
Calculation:
The leading coefficient of given polynomial is 5 and the constant term is 6.
So, possible rational zeros are:
Using synthetic division to check whether
Here, remainder is 0. So,
So,
Now, consider
The above polynomial is a second degree polynomial.
So, zeroes of a second degree polynomial can be found using the formula
Now, writing the given function as product of linear factors,
Calculation for graph:
Consider
Values of x | Values of f (x) |
0 | 6 |
1 | 30 |
-1 | -36 |
2 | 66 |
-2 | -126 |
By taking different values of x, the graph can be plotted.
Graph:
Interpretation:
Only real zeros of the function can be verified through graph.
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 zeros of given function are
Chapter 2 Solutions
Precalculus with Limits: A Graphing Approach
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