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The Edexcel C4 (21/06/12 - PM) Revision Thread

Reply 180

arnab

11

Original post by grazie

You might kick yourself :wink:

.

Spoiler

ohh wow, i am so dumb! thanks mate

Reply 181

grazie

2

Original post by Jack_Smith

Help on this question
Solomon paper D
Question 3
http://www.school-portal.co.uk/GroupDownloadFile.asp?GroupId=1152243&ResourceId=3992061
Please =D I cant do the question below which is so easy due to not doing the first part :/

The question gives you a clue as to what's needed as it states the form of the answer required. You just have to work out the missing coefficients. The fraction given is what is often termed 'top heavy', i.e. the expression on top is of a higher (or equal) order to the expression on the bottom. So you've got a cubic expression on top and a quadratic on the bottom. In order to do partial fractions, the original fraction has to be in standard or 'bottom heavy' form.

Do long division on the two expressions and create partial fractions with the remainder.

(edited 11 years ago)

Reply 182

grazie

2

Original post by arnab

ohh wow, i am so dumb! thanks mate

Been there, done that, got the T-shirt :biggrin:

Reply 183

F1's Finest

21

Hi guys, just wondering, for the Jan 2012 C4 paper, on question 6, for part b, which asks for us to use the trapezium rule, why does the mark scheme use the height 'h' as pi/8 ?

Shouldn't the height be the highest x value minus the lowest x value, which in this case is pi/2 - 0 = pi/2

However the ms uses pi/8?

Any help would be appreciated !

Reply 184

shahruk

Original post by James A

Hi guys, just wondering, for the Jan 2012 C4 paper, on question 6, for part b, which asks for us to use the trapezium rule, why does the mark scheme use the height 'h' as pi/8 ?

Shouldn't the height be the highest x value minus the lowest x value, which in this case is pi/2 - 0 = pi/2

However the ms uses pi/8?

Any help would be appreciated !

From what I know, height = (upper limit - lower limit)/number of strips used

generally, if the table is given for you, the increase in x values is the height... for example 0 -> pi/8 -> pi/4

height = pi/4 - pi/8 = pi/8 :smile:

Reply 185

F1's Finest

21

Original post by shahruk

From what I know, height = (upper limit - lower limit)/number of strips used

generally, if the table is given for you, the increase in x values is the height... for example 0 -> pi/8 -> pi/4

height = pi/4 - pi/8 = pi/8 :smile:

Cheers mate! :biggrin:

I thought it was just highest x value - lowest x value

I would have been screwed if that was the real exam lol

Reply 186

shahruk

Original post by James A

Cheers mate! :biggrin:

I thought it was just highest x value - lowest x value

I would have been screwed if that was the real exam lol

dont mention it ! I was confused about that too :smile:

Reply 187

lukas1051

18

Original post by James A

Hi guys, just wondering, for the Jan 2012 C4 paper, on question 6, for part b, which asks for us to use the trapezium rule, why does the mark scheme use the height 'h' as pi/8 ?

Shouldn't the height be the highest x value minus the lowest x value, which in this case is pi/2 - 0 = pi/2

However the ms uses pi/8?

Any help would be appreciated !

The above poster is correct. 'h' is the difference between two x values. The other way to work this out is using (b - a)/n where b is the highest value, a is the lowest value and n is the number of strips (ie. number of x values - 1). It's much easier to forget all these formulas and just take note of the fact that it is the difference between two values.

Reply 188

user977153

Need a D in this paper for an A! Sorted!

Reply 189

shahruk

Original post by DoctorVertigo

Need a D in this paper for an A! Sorted!

shoudn't relax just because of that though :P aim should be a 100 for at least the core units!

Reply 190

user977153

Original post by shahruk

shoudn't relax just because of that though :P aim should be a 100 for at least the core units!

Yeah I know I know, you sound like my parents lol. I need 90UMS in C4 for an A* :smile:

Reply 191

arnab

11

anyone else completing the review exercise first before hitting the past-paper? there is only about 11papers :frown:

Reply 192

shahruk

Original post by DoctorVertigo

Yeah I know I know, you sound like my parents lol. I need 90UMS in C4 for an A* :smile:

Hope for the best lol :P i only say it because of experience, my friend's experience :/

Reply 193

DH3498

I understand part a), but part b)?... :s

Cheerss :smile:

Reply 194

StraightUpG

1

any1 doing solomon papers?

Reply 195

Jack_Smith

8

Help on solomon paper K..I think they have got some sort of mix up on the ms
Solomon K Qs
3B
I got the answer ln1/6 + 1/3 whereas they are getting 1/3 - ln6 :/ help please!
http://www.school-portal.co.uk/GroupDownloadFile.asp?GroupId=1152243&ResourceId=3992068
http://www.school-portal.co.uk/GroupDownloadFile.asp?GroupId=1152243&ResourceId=3992056

Reply 196

Jack_Smith

8

Original post by StraightUpG

any1 doing solomon papers?

Yep im doing these before edexcel, so im hoping to find edexcel papers easier!

Reply 197

StraightUpG

1

Original post by Jack_Smith

Yep im doing these before edexcel, so im hoping to find edexcel papers easier!

you gna do them all?

Reply 198

Jack_Smith

8

Original post by StraightUpG

you gna do them all?

well im on K :/ so i dont see why i cant do another one! Seriously mate do solomon papers and you would find edexcel easier! Just keep doing the solomon even thought he first paper might just put you off :/