(a)
To explain: Double the value of endpoints two and get the average value of function as
(a)

Answer to Problem 21E
The approximate value of area under the curve is
Explanation of Solution
Given information:
Use trapezoidal sums to approximate the average value over the interval
Consider the given information,
Now, add double two end points and find the average value of the function.
Therefore, the obtained value is
(b)
The explanation about to makes more sense not to double the endpoint values.
(b)

Answer to Problem 21E
Due to increasing error, the doubling of the values does not make sense.
Explanation of Solution
Given information:
Refer the table form the previous question.
Consider the given information,
Since the trapezoidal rule evaluates the area under the curve by dividing the total area into small trapezoids. This rule takes the average of the left and the right sum.
While doubling the values of the table only endpoints, the error of first and last trapezoid will increase in the given interval
Therefore, it is not make sense to double the endpoints values.
Chapter 5 Solutions
Advanced Placement Calculus Graphical Numerical Algebraic Sixth Edition High School Binding Copyright 2020
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