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Series Rewrite Question: How to Progress from the First Step to the Second Step?

Thread starter Teachme
Start date Dec 11, 2011
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Teachme

Thread starter
Dec 11, 2011

#1

Picture of problem included. Just wondering how to get from the first step to the second step?
Thanks!

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LCKurtz

Science Advisor

Homework Helper

Dec 11, 2011

#2

Teachme said:

Picture of problem included. Just wondering how to get from the first step to the second step?
Thanks!

Factor a 4 out of the numerator.

Teachme

Dec 11, 2011

#3

That leaves me with 4 (1^n/3^n-1) though doesn't it?

LCKurtz

Science Advisor

Homework Helper

Dec 11, 2011

#4

Teachme said:

That leaves me with 4 (1^n/3^n-1) though doesn't it?

No. What is [itex]4^1\cdot 4^{n-1}[/itex]?

Teachme

Dec 11, 2011

#5

Oh I see now. Thanks!

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