Posted by **GGIFT** on Thursday, February 25, 2010 at 8:05am.

If I add:

1+2x+6x^2+9x^3+7-2x+6x^2-9x^3...

won't I have to combine terms & then get

8+12x^2

cause won't the 9x^3 and the 2x cancel itself out???

- ALGEBRA -
**Reiny**, Thursday, February 25, 2010 at 8:17am
You can only add/subtract "like" terms, that is, you can add x^3's to x^'s, x's to x's etc.

so yes, you are right.

- ALGEBRA -
**GGIFT**, Thursday, February 25, 2010 at 8:20am
thanks!!!

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