
Concept explainers
(a)
To find: all the real zeros of the given function.
(a)

Answer to Problem 50E
The real zeros are x=−5,5,4
Explanation of Solution
Given information:
Consider f(x)=x3−4x2−25x+100
Calculation:
Find the zero’s of the given function
The function
f(x)=x3−4x2−25x+100(x−4)(x+5)(x−5)=0x=−5,5,4
Hence, the real zeros are x=−5,5,4
(b)
To find: whether the multiplicity of the each zero of the given function is even or odd .
(b)

Answer to Problem 50E
Multiplicity of x=−5,5,4 is odd.
Explanation of Solution
Given information:
Consider f(x)=x3−4x2−25x+100
Calculation:
From part a,
The real zeros are x=−5,5,4
Multiplicity of x=−5,5,4 is =1
Hence, Multiplicity of x=−5,5,4 is odd .
(c)
To find: the maximum possible number of turning points of the given function.
(c)

Answer to Problem 50E
The maximum number of turning points =3
Explanation of Solution
Given information:
Consider f(x)=x3−4x2−25x+100
Calculation:
The maximum number of turning points is one less than the degree of the function
Degree of the function is
=3
Hence, the maximum number of turning points =2
(d)
To plot: the given function and to verify the results of previous parts.
(d)

Explanation of Solution
Given information:
Consider f(x)=x3−4x2−25x+100
Graph:
The graph of the f(x)=x3−4x2−25x+100 is shown below
Hence, the results of previous parts are correct from the graph.
Chapter 2 Solutions
Precalculus with Limits
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