a.) Identify all errors. Briefly explain why they were errors. b.) Find a correct evaluation of this integral.

Calculus: Early Transcendentals
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Author:James Stewart
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Chapter1: Functions And Models
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a.) Identify all errors. Briefly explain why they were errors.

b.) Find a correct evaluation of this integral.

1. Consider the integral z(r + 2)
d.r.
The following is an INCORRECT evaluation of this integral.
1
2
We decompose the integrand using partial fractions:
1
Then we can evaluate
a(x + 2)
I+2
2
roo
dr
r(x + 2)
1
dr
I+2
1
dr
roo
1
dr
I +2
-
2| -|
= In Joo| – In 1 - (In |o0| – In 3)
In |æ + 2||
%3D
Since In |o0| = 0, the integral /
dx diverges, so the entire integral diverges.
(a) Identify all errors. Briefly explain why they were errors.
(b) Find a correct evaluation of this integral. Make sure to show all of your work.
Transcribed Image Text:1. Consider the integral z(r + 2) d.r. The following is an INCORRECT evaluation of this integral. 1 2 We decompose the integrand using partial fractions: 1 Then we can evaluate a(x + 2) I+2 2 roo dr r(x + 2) 1 dr I+2 1 dr roo 1 dr I +2 - 2| -| = In Joo| – In 1 - (In |o0| – In 3) In |æ + 2|| %3D Since In |o0| = 0, the integral / dx diverges, so the entire integral diverges. (a) Identify all errors. Briefly explain why they were errors. (b) Find a correct evaluation of this integral. Make sure to show all of your work.
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