SOLUTION: find first term of a geometric sequence whose fifth term and eighth term are 405 and 10935 respectively.
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Question 978581: find first term of a geometric sequence whose fifth term and eighth term are 405 and 10935 respectively.
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
That is three ratio's worth, for a variable r.
and then work from index 5 downward to index 1.
.
.
Going from the term number 5 to the term number 1 is a change by four of the common ratio. Can you find this?
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