Concept explainers
a.
To find: the area A of the window as a function of x .
a.

Answer to Problem 74E
Explanation of Solution
Calculation:
A window of perimeter 16 feet is constructed by adjoining a semicircle to the top of an ordinary rectangular window is given below:
The perimeter of the window is:
Perimeter = Length of three sides of the rectangle + arc of the semi circle
It is given that the perimeter of window is16. This gives that,
Now area of the window is,
Area = Area of rectangle + Area of semi circle
Substitute
Conclusion The area A of the window as a function of x is
b.
To find: the dimensions that produce maximum enclosed area.
b.

Answer to Problem 74E
The dimensions that produce maximum enclosed area are
Explanation of Solution
Given:
The area A of the window as a function of x is
Concept Used:
For the function
When
When
Calculation:
Now compare the given function
Clearly
So by the above definition, f has a maximum at
So, the dimensions that produce maximum enclosed area is,
From part (a),
Conclusion:
The dimensions that produce maximum enclosed area are
Chapter 2 Solutions
EBK PRECALCULUS W/LIMITS
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