My Math Forum  

Go Back   My Math Forum > High School Math Forum > Algebra

Algebra Pre-Algebra and Basic Algebra Math Forum


Reply
 
LinkBack Thread Tools Display Modes
October 3rd, 2016, 01:58 PM   #1
Newbie
 
Joined: Oct 2016
From: United States of America

Posts: 7
Thanks: 0

Post Shifted Geometric Sequences

I am currently taking Advanced Algebra and we have a test with a couple of questions about Shifted Geometric Sequences.

I understand how to find a specific term in a sequence (The 10th term, etc.) when I am given an equation such as Un=Un-1(1+0.6)+30 with the first term, and I can identify a shifted geometric sequence with no issues.

However, my problem is finding the equation when I am given the terms.

Example?: 0, 20, 38, 44, 68

Help??

Last edited by Imnomermaid112; October 3rd, 2016 at 02:05 PM.
Imnomermaid112 is offline  
 
October 3rd, 2016, 03:25 PM   #2
Math Team
 
Joined: Jul 2011
From: Texas

Posts: 2,883
Thanks: 1503

Quote:
Example?: 0, 20, 38, 44, 68
That is not a geometric sequence, because there is no common ratio.

Are you sure the 4th term is 44 and not 54?

Last edited by skipjack; October 6th, 2016 at 05:56 AM.
skeeter is offline  
October 5th, 2016, 01:44 PM   #3
Newbie
 
Joined: Oct 2016
From: United States of America

Posts: 7
Thanks: 0

Yes, that's what I meant, thank you for pointing out my error.

Anyways, I figured out how to do it, so I won't need any further assistance. Thank you!
Imnomermaid112 is offline  
October 6th, 2016, 06:02 AM   #4
Global Moderator
 
Joined: Dec 2006

Posts: 20,469
Thanks: 2038

Quote:
Originally Posted by skeeter View Post
Are you sure the 4th term is 44 and not 54?
That suggests that 0, 20, 38, 54, 68 was intended, with the first differences being an arithmetic progression, so it wouldn't be a shifted geometric sequence.
skipjack is online now  
October 6th, 2016, 06:13 AM   #5
Math Team
 
Joined: Jul 2011
From: Texas

Posts: 2,883
Thanks: 1503

Quote:
Originally Posted by skipjack View Post
That suggests that 0, 20, 38, 54, 68 was intended, with the first differences being an arithmetic progression, so it wouldn't be a shifted geometric sequence.
I thought I said that ...

I just asked about the 44 term to try and make some mathematical sense from the sequence the OP listed.
skeeter is offline  
Reply

  My Math Forum > High School Math Forum > Algebra

Tags
geometric, sequences, shifted



Search tags for this page
Click on a term to search for related topics.
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
THIS HAS TO BE POSSIBLE, SHIFTED GEOMETRIC FORMULA? carocrazy132 Algebra 19 July 29th, 2015 11:32 PM
geometric sequences and summation DATAfiend Pre-Calculus 6 November 16th, 2014 06:08 PM
Geometric Sequences & Series bilano99 Algebra 3 April 5th, 2012 12:36 PM
Possible Geometric Sequences Evil Tomato Algebra 5 September 3rd, 2010 07:00 PM
THIS HAS TO BE POSSIBLE, SHIFTED GEOMETRIC FORMULA? carocrazy132 Abstract Algebra 1 December 31st, 1969 04:00 PM





Copyright © 2019 My Math Forum. All rights reserved.