Algebra Pre-Algebra and Basic Algebra Math Forum

 January 20th, 2019, 04:00 AM #1 Newbie   Joined: Nov 2018 From: Indianapolis Posts: 18 Thanks: 0 Please help with number strings How do you find the nth term (edit) which have say the fifth term ascending instead of descending e.g. -576; -1025, -1728, -2816, -2241 Last edited by Jeff Shreeves; January 20th, 2019 at 04:23 AM.
 January 20th, 2019, 04:12 AM #2 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038 ....1........2........3........4.........5 -576; -1025, -1728, -2816, -2241 Ask a silly question, get a silly answer...
January 20th, 2019, 04:23 AM   #3
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Quote:
 Originally Posted by Denis ....1........2........3........4.........5 -576; -1025, -1728, -2816, -2241 Ask a silly question, get a silly answer...

Last edited by Jeff Shreeves; January 20th, 2019 at 04:30 AM.

 January 20th, 2019, 05:09 AM #4 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038 Answer this: how do you find the 3rd term -1728? Look up "arithmetic sequences" and "geometric sequences".
 January 20th, 2019, 05:37 AM #5 Global Moderator   Joined: Dec 2006 Posts: 20,835 Thanks: 2162 Where did the numbers come from? Is it known why the third is three times the first?
January 20th, 2019, 06:46 AM   #6
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From: Indianapolis

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Quote:
 Originally Posted by skipjack Where did the numbers come from? Is it known why the third is three times the first?
Why does the third being three times the first help ?

 January 20th, 2019, 08:22 AM #7 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038 Repeating Skipjack's question: WHERE did the numbers come from? WHAT do they represent? The month to month reduction of the rat population in Timbuktu?

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