How do I solve this I know the I am supposed to use Alternating Series Test, but I have not encountered (-2)^n, i am used to (-1)^n
http://i.imgur.com/bGGI3yy.png
Thanks

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You can just rewrite \((-2)^{n}=2^{n}*(-1)^{n}\)

Do you know the alternating series test?

It has to satisfy that an+1<= an and lim an = 0

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