is this method allowed?

[qshyrn]

are we allowed to use  hte double derivative to find out the nature of a stationary point???

[superflya]

yes

[olly_s15]

really?! In our methods exams?

[shinny]

Huh, if my memory serves me well, I thought the answer was no =\ It's only explicitly taught in Specialist I thought (unless CAS has changed things)?

[qshyrn]

yes

ok .  a quote from some tsfx brochure or something which i read  "As an example, many students are not aware of the following:That if you use the second derivative to prove the nature of a stationary point, even if your
workings are correct, you will not obtain any marks." --wtf

btw: my methods teacher said its allowed 

[superflya]

hmm im not that sure but y wouldnt u be allowed?

[the.watchman]

really?! In our methods exams?

I don't think we're supposed to use it for methods, although it sure sounds like a good way!

hmm im not that sure but y wouldnt u be allowed?

Well, it's not in the syllabus...

[shinny]

hmm im not that sure but y wouldnt u be allowed?

Well, it's not in the syllabus...

Yep. Spesh students aren't meant to have any advantage over the Methods ones.

[superflya]

so weve gotta use the lame table with the shapes and sub in values. -.-

[the.watchman]

so weve gotta use the lame table with the shapes and sub in values. -.-

I know ... it sucks
But that's what we gotta do!

[Martoman]

Yes I can confirm this. Showing concativity is not sufficient to show nature of points (IN METHODS). HOWEVER, it is a very very very useful shortcut you can do mentally (or writing out) to see if your little gay table works out (especially if the second derivative is a linear function).

[m@tty]

yes

ok .  a quote from some tsfx brochure or something which i read  "As an example, many students are not aware of the following:That if you use the second derivative to prove the nature of a stationary point, even if your
workings are correct, you will not obtain any marks." --wtf

btw: my methods teacher said its allowed  

Last year the TSFX lady said that next year[this year] any correct method will be allowed, and awarded marks. She mentioned the second derivative test as an example. I don't know if it's correct. but that's what she said.

[the.watchman]

IMO I would play it safe
Just use the table in your working, but you can always apply the second derivate to check

[superflya]

yes

ok .  a quote from some tsfx brochure or something which i read  "As an example, many students are not aware of the following:That if you use the second derivative to prove the nature of a stationary point, even if your
workings are correct, you will not obtain any marks." --wtf

btw: my methods teacher said its allowed 

Last year the TSFX lady said that next year[this year] any correct method will be allowed, and awarded marks. She mentioned the second derivative test as an example. I don't know if it's correct. but that's what she said.

LOL

[superflya]

IMO I would play it safe
Just use the table in your working, but you can always apply the second derivate to check

id rage if i lost marks for using the second derivative lulz