
Concept explainers
(a)..
To find: The graphical approximation of the limit by a graphing utility to graph the function.
(a)..

Answer to Problem 33E
The required limit of the function is limx→1x−1x2−1=12 and the graph for it is shown in Figure 4..
Explanation of Solution
Given:
The given function is limx→1x−1x2−1 .
Calculation:
Consider the given equation is,
limx→1x−1x2−1
Press Y and key in the function the snip for the display is shown in Figure 1
Figure 1
Press the window button to choose the proper scale. The display is shown in Figure 2
Figure 2
Select the widow button to choose the proper scale as shown in Figure 3
Figure 3
Press the graph button to graph the function as shown in Figure 4
Figure 4
The required limit of the function is,
limx→1x−1x2−1=12
(b)..
To find: The approximation for the limit of by the table feature of the graphing utility.
(b)..

Answer to Problem 33E
The value of the limit is limit is 12 .
Explanation of Solution
Calculation:
On the graphing calculator press 2nd window to choose ask as shown in Figure 5
Figure 5
Press 2nd graph and type the values of x as 0.9, 0.99, 0.999, 1, 1.001, 1.01 and 1.1. The display is shown in Figure 6
Figure 6
From the above table the nearest value as x approaches from left of 1 is 0.5.
Hence, the limit is 12 .
(c)..
To find: The evaluated form of the limit by the appropriate technique.
(c)..

Answer to Problem 33E
The limit of the function is 12 .
Explanation of Solution
Consider the given expression is,
f(x)=x−1x2−1
Then,
f(x)=x−1(x−1)(x+1)=12
Then, the limit of the function is 12 .
Chapter 12 Solutions
EBK PRECALCULUS W/LIMITS
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