- #1
aces9113
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Homework Statement
i need to make the function 1/(1+7x)^2 into a power series that goes from n=1 to infinity. I know that i have to get the answer through differentiating because the for the previous problem, i found that the function 7/(1+7x) resulted in ( -1 )^n* 7*7^n*x^n when n=0 to infinity
Homework Equations
The Attempt at a Solution
I know that as 1/(1-x) equals x^n and 1/(1-x)^2 equals n*x^(n-1) when n begins at 1 so i tried to use that. my previous try was (1)^n*(-1)*x^(n-1)*7^(2n-1)*(n). I'm on my last try and I really need help!