Create a thread to answer the following questions. • In your own words and using appropriate figures, describe the methods of upper sums and lower sums in approximating the area of a region. • A function is continuous, nonnegative, concave upward, and decreasing on the interval [0, a]. Does using the right endpoints of the subintervals produce an overestimate or an underestimate of the area of the region bounded by the function and the x-axis? Jus answer.

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Author:Erwin Kreyszig
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calculus 2

1. Create a thread to answer the following questions.
• In your own words and using appropriate figures, describe the methods of upper sums and lower sums in approximating the area of a region.
• A function is continuous, nonnegative, concave upward, and decreasing on the interval [0, a]. Does using the right endpoints of the subintervals produce an overestimate or an underestimate of the area of the region bounded by the function and the x-axis? Justify your
answer.
Transcribed Image Text:1. Create a thread to answer the following questions. • In your own words and using appropriate figures, describe the methods of upper sums and lower sums in approximating the area of a region. • A function is continuous, nonnegative, concave upward, and decreasing on the interval [0, a]. Does using the right endpoints of the subintervals produce an overestimate or an underestimate of the area of the region bounded by the function and the x-axis? Justify your answer.
Expert Solution
Step 1: Information

Using lower Riemann sum the area under the curve bounded by the curve y equals f left parenthesis x right parenthesis in [a, b] using n partitions of the interval is given by

A subscript L equals sum from i equals 0 to n minus 1 of space f open parentheses x subscript i close parentheses space increment x subscript i
h e r e space increment x subscript i space i s space t h e space w i d t h space o f space t h e space i t h space p a r t i t i o n.

In lower Riemann sum we take hight of the rectangle at left end point of the partition. 

Similarly using upper Riemann sum the area under the curve bounded by the curve y equals f left parenthesis x right parenthesis in [a, b] using n partitions of the interval is given by

A subscript R equals sum from i equals 0 to n minus 1 of space f open parentheses x subscript i close parentheses space increment x subscript i

In upper Riemann sum we take hight of the rectangle at right end point of the partition. 

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