C2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST

Original post by 0range

...

You'd probably lose 1 or 2 depending on the examiner. 1 for accuracy and 1 for poor method as you confused your x and y values, although, some examiners may count your method as correct and just wrong values.

Reply 382

Klaw

Original post by Sarah2000

Can someone send me the link to the unofficial mark scheme plz, i cant find it :smile:

It's at the bottom of the first post

(edited 11 years ago)

Reply 383

Squiggle

1

Really happy with how that went. With the trig question with sincostan....I got the first 3 values correct and said x = 0, 180, 90 but then went on to do incorrect working out...is that all the marks gone or would they turn a blind eye and give me 2 or 3?

Reply 384

Putch1

2

For 6b) Anyone here forgot to put the 2x values and just straight divided it by 2?

This was posted from The Student Room's iPhone/iPad App

Reply 385

Original post by silentlife

Oh **** misread perimeter of sector as perimeter of triangle... - how many marks would that be lost?

Probably all the marks seeing as it clearly said "sector" unfortunately.

I find it hard to believe that this many people are complaining about this question when it was very clearly worded.

I have to be honest I did read over it twice expecting it to ask us to find the area of the segment but it didn't so I left the sector as it was.

Reply 386

Original post by Squiggle

Really happy with how that went. With the trig question with sincostan....I got the first 3 values correct and said x = 0, 180, 90 but then went on to do incorrect working out...is that all the marks gone or would they turn a blind eye and give me 2 or 3?

You will get 3 marks for your 3 solutions, maybe 4 if you're lucky for your method but I doubt it seeing as it was only a 5 mark question with 5 solutions.

Reply 387

Original post by Joshmeid

You will get 3 marks for your 3 solutions, maybe 4 if you're lucky for your method but I doubt it seeing as it was only a 5 mark question with 5 solutions.

guys for part c) circle my method was correct how many marks would i lose?
and for the factor therom i sub and got 0 but did not say is factor but showed working and mentions equal to 0 and this is what the mark scheme says f ( 1) 0 − = with no sign or substitution*
errors and for conclusion.

Reply 388

Original post by Putch1

For 6b) Anyone here forgot to put the 2x values and just straight divided it by 2?

This was posted from The Student Room's iPhone/iPad App

Did you get all the 5 correct solutions? If your method is clearly written down such as:

x = \frac {\cos^{ -1 }{\left(\frac{1}{5}\right)}}{2} = 39.2°(1dp)

Then you should be awarded the marks.

Reply 389

gdunne42

21

Original post by Sarah2000

Can someone send me the link to the unofficial mark scheme plz, i cant find it :smile:

the title of this thread says Paper and Solutions in the FIRST POST that's where you'll find them

Reply 390

m1a1tank

1

Man im such an IDIOT :frown:

on the diffrentiation question (i think its q8) when we find the minimum x value. I got it all right. up to x^3=120/4 x pi... i wrote that as x^3= 30 x pi instead of 30/pi :/
how many marks do you reckon i'll lose on that? That was the only part where i went wrong on that question.

Also with the trig part for where (1-5cos2x)sin2x=0, i decided to divide by sin2x to get rid of that, then find only my cos values. i didn't think about finding values for sin2x either :frown:

do you reckon i'll only drop around 2/3 marks for that?

Reply 391

Putch1

2

Original post by otrivine

guys for part c) circle my method was correct how many marks would i lose?
and for the factor therom i sub and got 0 but did not say is factor but showed working and mentions equal to 0 and this is what the mark scheme says f ( 1) 0 − = with no sign or substitution*
errors and for conclusion.

For factor therom question, you will lose one mark for not concluding that it is a factor.

Your question about part c) circles does not make sense? =/

Reply 392

Original post by otrivine

guys for part c) circle my method was correct how many marks would i lose?
and for the factor therom i sub and got 0 but did not say is factor but showed working and mentions equal to 0 and this is what the mark scheme says f ( 1) 0 − = with no sign or substitution*
errors and for conclusion.

3. c) 1 mark lost if your method is clear and correct, given that you made a calculation error.

4. a) It depends on the examiner, you may lose 1 mark at maximum as mark schemes generally do require a conclusion.

Reply 393

Original post by gdunne42

the title of this thread says Paper and Solutions in the FIRST POST that's where you'll find them

guys for part c) circle my method was correct how many marks would i lose?
and for the factor therom i sub and got 0 but did not say is factor but showed working and mentions equal to 0 and this is what the mark scheme says f ( 1) 0 − = with no sign or substitution*
errors and for conclusion.

Reply 394

Original post by Joshmeid

3. c) 1 mark lost if your method is clear and correct, given that you made a calculation error.

4. a) It depends on the examiner, you may lose 1 mark at maximum as mark schemes generally do require a conclusion.

cause in the mark scheme for june 2011 mark scheme says f ( 1) 0 = with no sign or substitution*
errors and for conclusion.
?

Reply 395

Original post by Putch1

For factor therom question, you will lose one mark for not concluding that it is a factor.

Your question about part c) circles does not make sense? =/

even if you say =0?

Reply 396

Original post by m1a1tank

Man im such an IDIOT :frown:

on the diffrentiation question (i think its q8) when we find the minimum x value. I got it all right. up to x^3=120/4 x pi... i wrote that as x^3= 30 x pi instead of 30/pi :/
how many marks do you reckon i'll lose on that? That was the only part where i went wrong on that question.

Also with the trig part for where (1-5cos2x)sin2x=0, i decided to divide by sin2x to get rid of that, then find only my cos values. i didn't think about finding values for sin2x either :frown:

do you reckon i'll only drop around 2/3 marks for that?

For the differentiation question you will drop accuracy marks given that you have used the correct method. (You will drop 1/2 marks on part c and 1 mark on part d as the accuracy is affected in both parts).

For the trig, you will lose 3 marks as you are missing 3 solutions (0, 90, 180), although you may get a method mark for working out the cos values so expect around 2/3 marks for that question.

Reply 397

sophie0106

2

is there an unofficial mark scheme anywhere here?

Reply 398