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Something's wrong...could someone please check my work? Attachments to come...

Mathematics
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Here's the question:
1 Attachment
Here's the work that I've done:
Only one of the part's is wrong, but I'm not sure which one or what I did wrong...

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Other answers:

Could anyone help me?
Yes I am checking it.
Thanks so much! I've been waiting all night! :D
There will be -40x^3 ? Last one
instead of -800x^6 there may be -40x^3
@PoofyPenguin What do you think? I am rechecking my soln ... wait for 5 min.
I think that I made the mistake in that area but what about the 20x^3?
Yes...
1 Attachment
mistake is here
1 Attachment
Let me give it a try.
Yep! That was correct! Could you please explain what I did wrong? Where did the 20x^3 go?
see here :http://assets.openstudy.com/updates/attachments/50888f89e4b004fc96eb7b9e-sheldoneinstein-1351133302485-capture.jpg
You wrote \[\large{-40x^3}\] instead of -2 ... and that is the MISTAKE.
Alright! I see it now! Thanks so much for all of your help! :D
No problem.

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