C3 June 2012 - Post Exam Thread - Solutions and Paper in the FIRST POST

Basically I made the dumbest mistake ever. For q.6c, I subbed in 2x +3 into e^x, so I made the equation e^(2x+3) = 6 but missed out the +2 like an idiot. I carried on logged both sides, made x the subject, but I got x= 0.5(-3+ln6). I was just wondering how many marks you guys think I will lose out of 4?

1 mark the answer mark u get the other 3


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It was just this week was terrible ¬.¬

Physics to start things off was AWFUL and then geog made it worse and having C3/M3 clash the next day in the morning left me no time to relearn all my identities and stuf =.=

I EVEN got 6 wrong... the f(2x+3) THAT'S EASY!! =.=

EDIT and the range/domain and graph as a result =.=

I know the feeling...Physics for me was the worst possible start to my week and I mucked that question up as well so i've probably lost my A* in maths

Was it PHYA4 that you did on Mon?

Of course it was =[

Neither of these are mistakes? You've just written them out in a different format.

If you've ever seen a proper mark scheme (not the ones you typically find online) there is generally a half page to a full page of "notes", where alternate methods, simplifications, clarifications etc. are all written out. They cover pretty much everything so you should be fine.

Worst case possible, you might lose one mark for each if you have a really, really lazy/incompetent examiner who fails to recognise your alternate answer. But I reckon if you've laid your working out clearly there's a truly minimal chance of you not receiving full marks for both.

For Q6e, I drew the graphs properly with the right asymptotes and intersections, but I forgot to label which one is which,
how many marks do you think I'd lose for that?

I don't think you'll loose any marks. I think the first mark will be for the correct shape of both graphs. The second for the correct quadrant for the graphs. The third mark and fourth mark for the correct intersections.


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Beresford George,
just wondering, did you do c3 as well?
(might be a silly question) :P

How did you prepare for the exam?? did you just past papers or all of the solomon papers ect

Yeah I done C3 as well for the first time How did you find it?



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Ooh okay! Thought it was quite a good paper but i have no idea how i ended up drawing the graph intersecting each other.

How did you prepare for the exam?? did you just past papers or all of the solomon papers ect

Yeah. I didnt think it was too hard. It wasn't the hardest paper by far. I think I lost 2-4 marks for mistakes that I can remember depending on the mark scheme. How many marks do you reckon you lost?


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Who used implicit differentiation to do the last differentiation question?