# Science talk:Math Exam Resources/Courses/MATH100/December 2012/Question 07

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Thread title | Replies | Last modified |
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Discuss endpoints earlier | 3 | 22:08, 19 November 2013 |

The solution is good up until A(x) is obtained. I would like to see the discussion of the endpoints after this step, instead of later. It's a good way to pause and think about if A(x) makes sense, and it has to be done anyway. Also, the derivative is defined only on the open interval so that A'(-1) doesn't even make sense. Finally, I would like to see an extra step from A'(x) to 0=(1+x)(2x-1).

Changes made + a few more things. Is this what you had in mind?

I think we still need a comment that critical points can occur when the derivative is undefined. Not that this changes the solution much but students should still be aware.

CarmenBruni (talk)