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# C3 Differentiation Question Watch

1. (Original post by Zacken)
Yep, if the second derivative is less than 0 (i.e negative) then it's a maximum. Have you spotted why you got It should be - you probably forgot a minus whilst differentiating or something.
Yeah I did, thank you! I forgot to carry it onto the next line oops! And I didn't think differential sounded right, thanks for correcting me!
2. (Original post by Blake Jones)
Yeah I did, thank you! I forgot to carry it onto the next line oops! And I didn't think differential sounded right, thanks for correcting me!
Awesome, good job!
3. (Original post by Lollieboo)
Alright calm down cowboy. If you go to the 'report a post section', there is no option to report someone for giving a full solution or similar. So personally I only guidance of how to answer questions. No rules or strictly forbidding anything.
(Original post by RDKGames)
Yes there is. Not constructive.
Please do not post full solution unless as a last resort.

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