Posted by **B.B.** on Wednesday, April 21, 2010 at 10:14am.

Did I do this problem right?

Add. (x^9-2)+(x^9+2).

Here is what I did:

(x+x)^9+(-2+2)

2x^9+0

Is this correct? If not could you please explain it to me?

Thanks.

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