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|dw:1353786244962:dw|

\[\sum_{n=0}^{4}2(-2)^n\]
is one way of writing it.

oh. so that (-2), is that how it would go from negative to positive?

expand what i wrote and check for yourself

okay:
-2^0 = 0 *2 = 0
-2^1=-2*2=-4
-2^2=-4*2=-8
-2^3=-8*2=-16

ur doing the exponents wrong... this is basics...

OH SHOOT! i just noticed i started at 1. i just now noticed it starts at 0

okay okay, i got it now. it makes more sense starting at zero haha thank you. Medal for you :)