
Concept explainers
a.
To find: To find the function f(0) exists in the given graph.
a.

Answer to Problem 80E
The function f(0) exists in the given graph.
Explanation of Solution
Given:
From the graph we can observe that there is a hole and a solid dot at x=0 .
The solid dot means f(0) is been defined.
f(0)=1
Therefore we can conclude that the function f(0) is defined and exists.
b.
To find: To find the function limx→0f(x) exists in the given graph.
b.

Answer to Problem 80E
The function limx→0f(x) does not exist in the given graph.
Explanation of Solution
Given:
From the observation of the graph,
From the left hand side, limx→0f(x) approaches f(x)→4 at x→0 .
From the right hand side, limx→0f(x) approaches f(x)→1 at x→0 .
The function f(x) approaches two different values at x→0 .
Therefore the function limx→0f(x) does not exist.
c.
To find: To find the function f(2) exists in the given graph.
c.

Answer to Problem 80E
The function f(2) is undefined in the given graph.
Explanation of Solution
Given:
From the graph we can observe that there is a hole at x=2 .
The hole at x=2 means f(2) is been undefined.
Therefore we can conclude that the function f(2) is undefined.
d.
To find: To find the function limx→2f(x) exists in the given graph.
d.

Answer to Problem 80E
The function limx→2f(x) exists in the given graph.
Explanation of Solution
Given:
From the graph we can observe that,
From the left hand side and right hand side x→2 .
Therefore we can conclude that the function limx→2f(x) exists.
Chapter 11 Solutions
Precalculus with Limits: A Graphing Approach
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