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Geometric series as a function | Infinite sequences and series | AP Calculus BC | Khan Academy
Author: Khan Academy via YouTube
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Power series of the form Σk(x-a)ⁿ (where k is constant) are a geometric series with initial term k and common ratio (x-a). Since we have an expression for the sum of a geometric series, we can rewrite such power series as a finite expression. Created by Sal Khan.