#### ChrisChrisau

##### Member

- Joined
- Aug 3, 2008

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- HSC
- 2009

If a question asks to find a maximum on a complex curve and there is only one turning point, are we still expected to find the double differential?

For example, in the 2005 Maths paper, question 10 (b) (iv)

http://www.boardofstudies.nsw.edu.au/hsc_exams/hsc2005exams/pdf_doc/maths_05.pdf

There is only one turning point here. Do we still have to double differentiate to prove that it is a maximum?

All insight is much appreciated

Thanks!

Chris