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Edexcel C3,C4 June 2013 Thread

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Original post by StUdEnTIGCSE
Ah k.
I should go through the textbook, seem to have forgotten all the important stuff :redface:

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Implicit differentiation is C4 syllabus? needless to say the method of implicit differentiation is pretty obvious and could come up in C3
Original post by ChelseaSam
Implicit differentiation is C4 syllabus? needless to say the method of implicit differentiation is pretty obvious and could come up in C3


But what for those who haven't done C4 still, it'll be unfair! :angry:

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Original post by StUdEnTIGCSE


You can do it using C3 knowledge (i.e. without using implicit differentiation).
Original post by StUdEnTIGCSE


If you want to do it using C3 knowledge, then you would do it like this:

Spoiler

Original post by ChelseaSam
Implicit differentiation is C4 syllabus? needless to say the method of implicit differentiation is pretty obvious and could come up in C3



Original post by brittanna
If you want to do it using C3 knowledge, then you would do it like this:

Spoiler



Oh dear, didn't even realise implicit differentiation was C4!!! Never mind. :tongue:
Original post by brittanna
If you want to do it using C3 knowledge, then you would do it like this:

Spoiler



I don't understand how you went from line 1 to line 2. Other than that no problem

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Original post by StUdEnTIGCSE
I don't understand how you went from line 1 to line 2. Other than that no problem

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Spoiler



Does this help?
Original post by brittanna

Spoiler



Does this help?


Ah yes, I forgot that ln was a logarithm function and that you can play with it like a logarithm. :redface:

Thanks...

Should be more careful next time...

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Reply 2249
Avatar for zbert
zbert
http://www.youtube.com/watch?feature=player_embedded&v=P3owr0cwZbw#!

do we need to know how to do this?
Original post by zbert


Yeah, they asked it in one of the 2007 C3 papers.
Reply 2251
Avatar for maleeha1
maleeha1
june 2005 paper, Q8, core 4. Please can someone help? Cant get my head around this whole question! The mark scheme is just confusing me. Thankyou x
(edited 10 years ago)
image.jpg511.7KB
image.jpg232.4KB
Original post by maleeha1
june 2005 paper, Q8, core 4. Please can someone help? Cant get my head around this whole question! The mark scheme is just confusing me. Thankyou x


Can you upload the mark scheme for me to check my answer.
Do you know how to prove the first question? Its pretty self-explanatory to be honest. But do ask!
Reply 2253
Avatar for maleeha1
maleeha1
Original post by frogs r everywhere
Can you upload the mark scheme for me to check my answer.
Do you know how to prove the first question? Its pretty self-explanatory to be honest. But do ask!


with A, i understand how to explain the dv/dt bit, so id get the first mark. unsure of the second part about K.

but yeah, attached the mark scheme. thanks :-)
C4_June_2005_mark_scheme (2).doc464.4KB
Original post by frogs r everywhere
Oh dear, didn't even realise implicit differentiation was C4!!! Never mind. :tongue:


Implicit differentiation is C4? Really? :tongue:
Reply 2255
Avatar for YAH
YAH
guys, could you please check the MS for C4 solomon paper E
http://www.school-portal.co.uk/GroupDownloadFile.asp?GroupId=1152243&ResourceId=3992050
QUESTION 3)b) shouldn't it be +160
Reply 2256
Avatar for YAH
YAH
so nobody now is willing to help???:s-smilie:
Original post by YAH
guys, could you please check the MS for C4 solomon paper E
http://www.school-portal.co.uk/GroupDownloadFile.asp?GroupId=1152243&ResourceId=3992050
QUESTION 3)b) shouldn't it be +160


Yeah I think that what you've said is correct and they made an error.


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Original post by YAH
guys, could you please check the MS for C4 solomon paper E
http://www.school-portal.co.uk/GroupDownloadFile.asp?GroupId=1152243&ResourceId=3992050
QUESTION 3)b) shouldn't it be +160


If the previous line is correct, then yes, it should be +160.
Reply 2259
Avatar for YAH
YAH
Thanks

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