a.
To identify: The interval in which the function
a.
Answer to Problem 12RE
The function is increasing in the interval
Explanation of Solution
Given information:
The given function is
Consider the given function.
Calculate the derivative of the function.
Now determine the critical points.
By putting
So, the critical points are:
Now draw the table 1:
Intervals | |||||
Sign of derivative | |||||
Behavior of y | Increasing | Decreasing | Increasing | Decreasing | Increasing |
Intervals | |||||
Sign of derivative | |||||
Behavior of y | Decreasing | Increasing | Decreasing | Increasing |
Thus, from the table 1 it can be observed that the function is increasing in the interval
b.
To identify: The interval in which the function
b.
Answer to Problem 12RE
The function is decreasing in the interval
Explanation of Solution
Given information:
The given function is
Consider the given function.
It is known that the table 1 is
Intervals | |||||
Sign of derivative | |||||
Behavior of y | Increasing | Decreasing | Increasing | Decreasing | Increasing |
Intervals | |||||
Sign of derivative | |||||
Behavior of y | Decreasing | Increasing | Decreasing | Increasing |
Thus, from the table 1 it can be observed that the function is decreasing in the interval
c.
To identify: The interval in which the function
c.
Answer to Problem 12RE
The function is concave up in the interval
Explanation of Solution
Given information:
The given function is
Consider the given function.
Determine the second derivative and equate with zero.
So, the points where double derivative is zero:
Now draw the table 2:
Intervals | |||||
Sign of derivative | |||||
Behavior of y | Concave down | Concave up | Concave down | Concave up | Concave down |
Intervals | |||||
Sign of derivative | |||||
Behavior of y | Concave up | Concave down | Concave up | Concave down |
From the table 2 it can be observed that the function is concave up in the interval
d.
To identify: The interval in which the function
d.
Answer to Problem 12RE
The function is concave down in the interval
Explanation of Solution
Given information:
The given function is
Consider the given function.
It is known that the table 2 is:
Intervals | |||||
Sign of derivative | |||||
Behavior of y | Concave down | Concave up | Concave down | Concave up | Concave down |
Intervals | |||||
Sign of derivative | |||||
Behavior of y | Concave up | Concave down | Concave up | Concave down |
From the table 2 it can be observed that the function is concave down in the interval
Now draw the graph of the function.
Thus, answer is verified from the graph.
e.
To identify: The local extreme values of the function
e.
Answer to Problem 12RE
The local extrema at
Explanation of Solution
Given information:
The given function is
Consider the given function.
From the table 1 it can be observed that the function is concave down in the interval
(e) From the table (1) we have
Note that the local extrema at
f.
To identify: The inflection points of the function
f.
Answer to Problem 12RE
The inflection points are:
Explanation of Solution
Given information:
The given function is
Consider the given function.
There are 8 inflection points given by
Chapter 4 Solutions
CALCULUS:GRAPHICAL,...,AP ED.-W/ACCESS
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