Calculus: Early Transcendentals (2nd Edition)

Published by Pearson
ISBN 10: 0321947347
ISBN 13: 978-0-32194-734-5

Chapter 7 - Integration Techniques - 7.5 Partial Fractions - 7.5 Exercises - Page 550: 56

Answer

$$V = 2\pi \left( {2 - \ln 3} \right)$$

Work Step by Step

$$\eqalign{ & {\text{Let }}f\left( x \right) = \frac{1}{{x + 1}},\,\,\,\,a = 0,\,\,\,b = 2 \cr & {\text{Using the shell method }}V = \int_a^b {2\pi xf\left( x \right)} dx \cr & V = \int_0^2 {2\pi x\left( {\frac{1}{{x + 1}}} \right)} dx \cr & V = 2\pi \int_0^2 {\frac{x}{{x + 1}}} dx \cr & V = 2\pi \int_0^2 {\left( {1 - \frac{1}{{x + 1}}} \right)} dx \cr & {\text{Integrate}} \cr & V = 2\pi \left[ {x - \ln \left| {x + 1} \right|} \right]_0^2 \cr & V = 2\pi \left[ {2 - \ln \left| {2 + 1} \right|} \right] - 2\pi \left[ {0 - \ln \left| {0 + 1} \right|} \right] \cr & {\text{Simplify}} \cr & V = 2\pi \left( {2 - \ln 3} \right) \cr} $$
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