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Calculus: An Applied Approach (Min...

10th Edition
Ron Larson
ISBN: 9781305860919

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Calculus: An Applied Approach (Min...

10th Edition
Ron Larson
ISBN: 9781305860919
Textbook Problem
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Using the Trapezoidal Rule and Simpson’s Rule In Exercises 1-10, use the Trapezoidal Rule and Simpson’s Rule to approximate the value of the definite integral for the indicated value of n. Compare these results with the exact value of the definite integral. Round your answers to four decimal places. See Examples 1 and 2.

1 2 2 x d x , n = 8

To determine

The value of the integral 122xdx,n=8 by using the Trapezoidal Rule and Simpson’s Rule to approximate the value of the definite integral for the indicated value of n. Compare these results with the exact value of definite integral. Round your answers to four decimal places.

Explanation

Given Information:

The definite integral is 122xdx,n=8.

Formula used:

1. Trapezoidal Rule:

If a function f is continuous on [a,b], then

abf(x)dx(ba2n)[f(x0)+2f(x0)+...+2f(xn1)+f(xn)]

2. Simpson’s Rule:

If f is continuous on [a,b] and n is an even integer, then

abf(x)dx(ba3n)[f(x0)+4f(x1)+2f(x2)+4f(x3)++4f(xn1)+f(xn)]

Calculation:

Calculation to get exact value:

Consider the definite integral 122xdx,n=8.

122xdx=2ln|x|12=2ln21.3863

Therefore, the exact value: 122xdx1.3863.

Calculation by Trapezoidal Rule:

Consider the definite integral 122xdx,n=8.

When n=8, the width of each subinterval is.

218=18

And the end points of subintervals are.

For x0,

x0=1

For x1,

x1=98

For x2,

x2=54

For x3,

x3=54+18=118

For x4,

x4=118+18=128=32

For x5,

x5=32+18=138

For x6,

x6=138+18=74

For x7,

x7=74+18=158

For x8,

x8=158+18=2

By Trapezoidal Rule,

122xdx=12×8

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