Radius and interval of convergence Determine the radius and interval of convergence of the following power series. sum_{k=0}^inftyfrac{(x-1)^k}{k!}

alesterp

alesterp

Answered question

2020-11-12

Radius and interval of convergence Determine the radius and interval of convergence of the following power series.
k=0(x1)kk!

Answer & Explanation

Margot Mill

Margot Mill

Skilled2020-11-13Added 106 answers

Given: Series
k=0(x1)kk!
To Find: Radius and Interval of Convergence of given series
Concept Used: Ratio Test:
For a series with terms {an}, consider the ratio
limn|an+1an|=L
If L<1 then the series converges
Calculations:
Consider the ratio of the given series as follows:
|ak+1ak|=|(x1)k+1(k+1)!k!(x1)k|
|ak+1ak|=|(x1)k+1kk!(k+1)k!|
|ak+1ak|=|x1k+1|=1k+1|x1|
limk|ak+1ak|=limk|x1|k+1=|x1|limk1k+1
limk|ak+1ak|=|x1|(0)=0
Hence, L=0 for all values of x and so the given series converges for all x
The radius of convergence is given by :
R=1L=10=
And hence, the interval of convergence is
(,)
Answer:
The radius of convergence is
R= Interval of convergence is given by:
(,)

Jeffrey Jordon

Jeffrey Jordon

Expert2021-12-27Added 2605 answers

Answer is given below (on video)

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