if-x-a-1-r-n-1-r-make-r-the-subject-of-the-formula-

Question Number 9324 by uchechukwu okorie favour last updated on 30/Nov/16

i f x = \frac{a (1 - r^{n})}{1 - r} m a k e r t h e

s u b j e c t o f t h e f o r m u l a

Answered by mrW last updated on 30/Nov/16

let k = \frac{x}{a}

k = \frac{1 - r^{n}}{1 - r}

k - kr = 1 - r^{n}

r^{n} - kr + (k - 1) = 0

I {don}^{'} t think it is possible to get

a formula for r in terms of n and k .

Commented by uchechukwu okorie favour last updated on 30/Nov/16

h m m m