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: 76

Answer

$$\frac{3}{2}\ln \left| {{x^{2/3}} - 1} \right| + C$$

Work Step by Step

$$\eqalign{ & \int {\frac{{dx}}{{x - \root 3 \of x }}} \cr & {\text{letting }}x = {u^3},{\text{ }}dx = 3{u^2}du \cr & = \int {\frac{{dx}}{{x - \root 3 \of x }}} = \int {\frac{{3{u^2}du}}{{{u^3} - \root 3 \of {{u^3}} }}} \cr & = \int {\frac{{3{u^2}du}}{{{u^3} - u}}} = \int {\frac{{3u}}{{{u^2} - 1}}} du \cr & z = {u^2} - 1,{\text{ }}dz = 2udu,{\text{ }}udu = \frac{1}{2}dz \cr & \int {\frac{{3u}}{{{u^2} - 1}}} du = \frac{3}{2}\int {\frac{{dz}}{z}} \cr & = \frac{3}{2}\ln \left| z \right| + C \cr & {\text{with }}z = {u^2} - 1, \cr & = \frac{3}{2}\ln \left| {{u^2} - 1} \right| + C \cr & x = {u^3} \to u = \root 3 \of x \cr & = \frac{3}{2}\ln \left| {{{\left( {\root 3 \of x } \right)}^2} - 1} \right| + C \cr & = \frac{3}{2}\ln \left| {{x^{2/3}} - 1} \right| + C \cr} $$
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