Question

find the sum of the series...

Answer 1

\[\sum_{k=0}^{\infty} (4^{k}-3^{k})/5^{k}\]

Answer 2

sum of the geometric series with r=(4/5) minus the sum of the geometric series with r=(3/5)

Answer 3

what?

Answer 4

you haven't done geometric series?

Answer 5

I have but i dont understand it very well

Answer 6

\[\sum_{ }^{ } (4/5)^k -\sum_{ }^{ } (3/5)^k \]

Answer 7

use the formula for the sum of a geometric series for each of those