Calculus: Early Transcendentals (2nd Edition)

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

Chapter 5 - Integration - 5.5 Substitution Rule - 5.5 Exercises - Page 392: 76

Answer

$$\frac{1}{6}\ln \left( {\frac{{59}}{{36}}} \right)$$

Work Step by Step

$$\eqalign{ & \int_0^1 {\frac{{\left( {v + 1} \right)\left( {v + 2} \right)}}{{2{v^3} + 9{v^2} + 12v + 36}}} dv \cr & {\text{multiply in the numerator}} \cr & \int_0^1 {\frac{{{v^2} + 3v + 2}}{{2{v^3} + 9{v^2} + 12v + 36}}} dv \cr & {\text{set }}u = 2{v^3} + 9{v^2} + 12v + 36{\text{ then }}du = \left( {6{v^2} + 18v + 12} \right)dv \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,du = 6\left( {{v^2} + 3v + 2} \right)dv \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{1}{6}du = \left( {{v^2} + 3v + 2} \right)dv \cr & {\text{switch the limits of integration}} \cr & u = 2{v^3} + 9{v^2} + 12v + 36,\,\,\,\,v = 1 \to u = 59 \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,v = 0 \to u = 36 \cr & {\text{use the change of variable}} \cr & \int_0^1 {\frac{{{v^2} + 3v + 2}}{{2{v^3} + 9{v^2} + 12v + 36}}} dv = \int_{36}^{59} {\frac{{\left( {1/6} \right)du}}{u}} \cr & = \frac{1}{6}\int_{36}^{59} {\frac{{du}}{u}} \cr & {\text{integrate}} \cr & = \frac{1}{6}\left[ {\ln \left| u \right|} \right]_{36}^{59} \cr & {\text{evaluate the limits}} \cr & = \frac{1}{6}\left[ {\ln \left| {59} \right| - \ln \left| {36} \right|} \right] \cr & {\text{logarithmic properties}} \cr & = \frac{1}{6}\ln \left( {\frac{{59}}{{36}}} \right) \cr} $$
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