My Math Forum Finite geometric series

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 July 23rd, 2017, 10:05 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, 09:23 AM #2 Global Moderator   Joined: Dec 2006 Posts: 20,942 Thanks: 2210 The sequence has first term $(u_1 + u_1r)^2$, common ratio $r^2\!$, and $n - 1$ terms.
 July 24th, 2017, 11:44 AM #3 Math Team   Joined: Dec 2013 From: Colombia Posts: 7,675 Thanks: 2655 Math Focus: Mainly analysis and algebra Start by writing the given terms of the second sequence in terms of $u_1$.
 July 26th, 2017, 11:49 AM #4 Newbie   Joined: Jul 2017 From: Makakilo Posts: 3 Thanks: 0 Okay that makes sense, Thanks.

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