Asked by natalie
Find the sum (assume |x| < 1/3):
1+3x+9x^2+27x^3+81x^4+...=?
1+3x+9x^2+27x^3+81x^4+...=?
Answers
Answered by
Steve
This is just a geometric series where the common ratio is 3x.
So, S = 1/(1-3x)
So, S = 1/(1-3x)
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