Calculus 8th Edition

Published by Cengage
ISBN 10: 1285740629
ISBN 13: 978-1-28574-062-1

Chapter 11 - Infinite Sequences and Series - 11.10 Taylor and Maclaurin Series - 11.10 Exercises - Page 811: 20

Answer

$50-160(x+2)+216(x+2)^{2}-152(x+2)^{3}+59(x+2)^{4}-12(x+2)^{5}+(x+2)^{6}$ $R=\infty$

Work Step by Step

Taylor's series of $f$ centered at $a$ is $f(x)=\dfrac{f^{n}(a)(x-a)^{n}}{(n)!}=f(a)+f'(a)(x-a)+\frac{f''(a)(x-a)^{2}}{2}+\frac{f'''(a)(x-a)^{3}}{6}+....$ Given: $f(x)=x^{6}-x^{4}+2$ $x^{6}-x^{4}+2=50+(-160)(x+2)+\frac{432(x+2)^{2}}{2}+\frac{-912(x+2)^{3}}{6}+\frac{1416(x+2)^{4}}{24}+\frac{-1440(x+2)^{5}}{120}+\frac{720(x+2)^{6}}{720}$ $=50-160(x+2)+216(x+2)^{2}-152(x+2)^{3}+59(x+2)^{4}-12(x+2)^{5}+(x+2)^{6}$ and Since, the Taylor polynomial for given function only has finite number of terms , it converges for all values of $x$, so $R=\infty$.
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