Rewriting Power Series - Simple Algebra Question

[MillerGenuine]

Homework Statement

My question involves a small algebra issue within a power series problem. I have (-1)^n-1 and i just need to know how i can re-write this. I know that if it were (1)^n+1 i could re-write as (1)^n * (n)
So can i write (-1)^n-1 as (-1)^n * (-1) ?

Homework Equations

The Attempt at a Solution

 

[ystael]

To answer this, think about what $$(-1)^{-1}$$ is.

 

[gomunkul51]

(-1)^n-1 = [(-1)^n]/(-1)