Prove for r ≠ 1 that ∑_(k=0)^(n-1)(rk)=(1-rn)/(1-r). If ∑_(k=0)^(n-1)(rk), then compute s(1−r) = s−rs, and solve for s.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter2: Equations And Inequalities
Section2.1: Equations
Problem 62E
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Prove for r ≠ 1 that ∑_(k=0)^(n-1)(rk)=(1-rn)/(1-r).

If ∑_(k=0)^(n-1)(rk), then compute s(1−r) = s−rs, and solve for s.

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