July 23rd, 2017, 11:05 PM  #1 
Newbie Joined: Jul 2017 From: Makakilo Posts: 3 Thanks: 0  Finite geometric series
I was working on this problem and I was not able to find a starting term to use with the summation formulas for geometric series. 
July 24th, 2017, 10:23 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 18,154 Thanks: 1418 
The sequence has first term $(u_1 + u_1r)^2$, common ratio $r^2\!$, and $n  1$ terms.

July 24th, 2017, 12:44 PM  #3 
Math Team Joined: Dec 2013 From: Colombia Posts: 7,031 Thanks: 2342 Math Focus: Mainly analysis and algebra 
Start by writing the given terms of the second sequence in terms of $u_1$.

July 26th, 2017, 12:49 PM  #4 
Newbie Joined: Jul 2017 From: Makakilo Posts: 3 Thanks: 0 
Okay that makes sense, Thanks.


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finite, geometric, series 
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