Sums of Infinate Series...New Problem, Same Need For Help

[skyd92]

Again, still don't have the faintest idea of how to start the problem. I need some serious assistance.

Problem: "Identify an infinite geometric series that has a sum of 6 and a first term of 2."

...help...me... :shock:

 

[DrMike]

a general geometric series has terms a, ar, ar[sup:1fxso2f9]2[/sup:1fxso2f9], ar[sup:1fxso2f9]3[/sup:1fxso2f9]...

The first term is a.

The sum is given by a formula you will find in your class notes.

So you know that a=2, and the formula gives 6, so you can find r...

 

[skyd92]

the thing is, I don't have any class notes and my book is old as dirt and is just about as helpful. I don't know how to work the problem at all.

 

[DrMike]

Then you need some other resources. Maybe http://en.wikipedia.org/wiki/Geometric_series ?

Or, go to amazon.com, look for books on the topics you are studying, read the user reviews, and see if your local bookstore/library can get a copy of the best book you find...

 

[BigGlenntheHeavy]

To bad, so sad. By the way infinite is spelled infinite, not infinate.

 

[skyd92]

Re: Sums of Infinite Series...New Problem, Same Need For Help

Sorry, that was a stupid typo on my part. I was typing too fast. I am taking a distance learning course, I just want someone to explain this problem a bit clearer than my book did, that is all I ask.

 

[BigGlenntheHeavy]

If you are sincere, then look at the last one you posted. I gave you the formula for geometric series.