Calculus with Applications (10th Edition)

Published by Pearson
ISBN 10: 0321749006
ISBN 13: 978-0-32174-900-0

Chapter 12 - Sequences and Series - 12.3 Taylor Polynomials at 0 - 12.3 Exercises - Page 632: 33

Answer

$$ \approx 0.007968168$$

Work Step by Step

$$\eqalign{ & \ln 1.008 \cr & {\text{Using the result of Taylor polynomial of degree }}4{\text{ at }}x = 0{\text{ found in the exercise 12}} \cr & f\left( x \right) = \ln \left( {1 + 2x} \right){\text{ we found that}} \cr & {P_4}\left( x \right) = 2x - 2{x^2} + \frac{8}{3}{x^3} - 4{x^4} \cr & {\text{To approximate }}\ln 1.008,{\text{ we must evaluate }}\ln \left( {1 + 2\left( {0.004} \right)} \right),{\text{ then taking }}x = 0.004 \cr & {P_4}\left( {0.004} \right) = 2\left( {0.004} \right) - 2{\left( {0.004} \right)^2} + \frac{8}{3}{\left( {0.004} \right)^3} - 4{\left( {0.004} \right)^4} \cr & {P_4}\left( {0.004} \right) = 0.008 - 0.000032 + 0.00000017 - 0.000001024 \times {10^{ - 3}} \cr & {P_4}\left( {0.004} \right) = 0.007968168 \cr & {\text{Thus}}{\text{, }}\ln 1.008 \approx 0.007968168 \cr} $$
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