Wednesday
April 1, 2015

Homework Help: math!

Posted by Anonymous on Wednesday, October 18, 2006 at 2:16pm.

determine two geometreic sequences whose first terms are 18x-9, 2x+8 and x-1

how would I go about and do this question?
I have no idea! so a little help would be really helpful! thanks!


A geometric sequence looks like
a, ar, ar2, ar3, ..., arn, ...
where a is usually called the base and r is the common ratio.

If the first three terms are 18x-9, 2x+8 and x-1 then
(2x+8)/(18x-9) = (x-1)/(2x+8)
i.e., the ratio of tn/tn-1 is the common ratio.
So solve
(2x+8)*(2x+8)=(18x-9)*(x-1) for x.
Then substitute the values of x into the first 3 terms to determine what they are, then follow the above to determine the common ratio, the base, then the general or nth term.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Math+ check! - oka so the question is as follows: for the geometreic sereis 8+48...
science 1 question - Explain how a scientist would use DNA or protein sequences ...
Algebra 2: Sequences and Series - I have this question and I don't understand ...
math sequences and series - how do i solve the sum of the first two terms of an ...
Math - I'm learning series and sequences (grade 11). Please check that my steps ...
Biology - (This question ties into the previous question I posted about mRNA). ...
Maths - Hi, have completed a whole worksheet but the challenge involves finding ...
sequences and series - how do i solve the sum of the first two terms of an ...
math... - how can I tell if a sequences is airthmetic, geometric or neither? ...
Bus math case study 12.1 - Shantel and Kwamie are planning to buy their first ...

Members