
Concept explainers
(a)
To write: An expression for a double Riemann sum of the given function.
(a)

Answer to Problem 1RCC
The expression for a double Riemann sum is
Explanation of Solution
Given that the continuous function
The double integral of f over the rectangle R is given by,
Here,
The given continuous function is
The sample points of each rectangle is denoted by
The image value of the sample points under the function
The sum mentioned above
(b)
To write: The definition of
(b)

Answer to Problem 1RCC
The definition of
Explanation of Solution
The double integral can be expressed in terms of double Riemann sum as follows:
The double integral of f over the rectangle R is,
Here,
The given continuous function is
The sample points of each rectangle is denoted by
The image value of the sample points under the function
Thus, the definition of
(c)
To write: The geometric interpretation of
(c)

Explanation of Solution
When
If suppose the given function f takes both positive and negative values, then it does not denote the volume exactly. But, it is taken that the volume of the function of the two graphs one above the xy-plane and one below the xy-plane.
(d)
To evaluate: The value of the double integral
(d)

Answer to Problem 1RCC
The value of
Explanation of Solution
Rewrite the indefinite double integral by definite double integral from the equations or inequalities in the given rectangle. Then, as per the rules of
Thus, the value of
(e)
To interpret: About the Midpoint Rule for double integrals.
(e)

Explanation of Solution
The double integral,
Here,
The given function is
The mid points of each rectangle is denoted by
The Riemann sum constants are denoted by m, n.
Separate the given region by small rectangles by the method of Riemann sum for the double integrals. Then, pick the sample points from the Midpoint of each rectangle.
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Chapter 12 Solutions
Essential Calculus: Early Transcendentals
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