In the following exercise how can I find $a_1$ or $r$ (common ratio).
Find the sum of a geometric series for which $a_4 =-80$, $a_7=640$, and $n=12$.
2026-03-25 07:45:45.1774424745
How to find the sum of a geometric series for which $a_4 =-80$, $a_7=640$, and $n=12$
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Note that $$ a_7/a_4=r^3 $$ and $$ a_1=a_4/r^3 $$