
Concept explainers
(a)
The real zeros of the polynomial function.
(a)

Answer to Problem 39E
The real zero of the polynomial function is at x = -2 and x = 1
Explanation of Solution
Given information:
The given function
Formula used:
The real zeroes of the polynomial function by putting
Calculation:
It can be shown that for a polynomial function f of degree n, the following statements are true.
(1) The function has at most n real zeroes
(2) The graph of f has, at most n-1 turning points.
We can determine the real zeroes of the polynomial function by putting
So, the real zeroes for the given function are x = -2 and x =1
Hence, the real zero of the polynomial function is at x = -2 and x = 1
Conclusion:
The real zero of the polynomial function is at x = -2 and x = 1
(b)
The multiplicity of each zero is even or odd.
(b)

Answer to Problem 39E
The multiplicity is odd and there is only one turning point
Explanation of Solution
Given information:
The given function
Formula used:
The multiplicity of each zero is odd
Calculation:
It can be shown that for a polynomial function f of degree n, the following statements are true.
(1) The function has at most n real zeroes
(2) The graph of f has, at most n-1 turning points.
The degree of the given polynomial function is 2. So, there will be at most one turning point and multiplicity of each zero is odd.
Hence, the multiplicity is odd and there is only one turning point
Conclusion:
The multiplicity is odd and there is only one turning point
(c)
The maximum possible number of turning points of the graph of the function.
(c)

Answer to Problem 39E
Explanation of Solution
Given information:
The given function
Formula used:
The graph is plotted against the x axis and y axis.
Calculation:
It can be shown that for a polynomial function f of degree n, the following statements are true.
(1) The function has at most n real zeroes
(2) The graph of f has, at most n-1 turning points.
Let us draw the graph of the given polynomial function,
We can observe from the graph that the zeroes of the polynomial function are at x = -2 and
x = 1 and there is only one turning point.
Conclusion:
The zeroes of the polynomial function are at x = -2 and x = 1 and there is only one turning point.
Chapter 2 Solutions
Precalculus with Limits
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