(adsbygoogle = window.adsbygoogle || []).push({}); f(x)=4x/(7+x). Find the first few coefficients and radius of convergence

sum (n=0 to infinity) CnX^n

3. The attempt at a solution

I set up the equation into the form of a power series and got:

(-1)^n*(4)^n*(x/7)^(n+1)

But that doesn't seem to be right because I can't get the coefficients right. I know the first one is 0, but what I have doesn't give me that. the RoC is 7. What am I doing wrong?

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# Homework Help: Power Series Help

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