You can
put this solution on YOUR website!You start with

.
I would advise using brackets on the first term to help identify if it is positive or negative:

If the power of an negative number is even, the result is even
( (-1)^2= -1 x -1 = 1).
I the pwer of a negative number is odd, the result is odd also.
So:

I hope this helps,
Adam.
P.S. check out my website at http://www.geocities.com/quibowibbler