Problem

Identify the function represented by the following power series. \[ \sum_{k=0}^{\infty}(-1)^{k} \frac{x^{4 k}}{6^{k}} \] \# Click the icon to view a table of Taylor series for common functions. \[ f(x)= \]

Solution

Step 1 :Identify the function represented by the following power series: \[\sum_{k=0}^{\infty}(-1)^{k} \frac{x^{4 k}}{6^{k}}\]

Step 2 :The given power series is a geometric series with common ratio of \(-\frac{x^4}{6}\).

Step 3 :The sum of a geometric series is given by the formula \(\frac{a}{1-r}\), where \(a\) is the first term and \(r\) is the common ratio.

Step 4 :In this case, the first term \(a\) is 1 (when \(k=0\)), and the common ratio \(r\) is \(-\frac{x^4}{6}\).

Step 5 :So, the function represented by the power series is \(f(x) = \frac{1}{1+\frac{x^4}{6}}\).

Step 6 :Simplify the function to get the final answer: \(f(x) = \frac{6}{x^{4} + 6}\).

Step 7 :\(\boxed{f(x) = \frac{6}{x^{4} + 6}}\) is the function represented by the power series.

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Source: https://solvelyapp.com/problems/2LYgI15cH5/

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