Edexcel C1, C2 June 2013

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Yeah when I tried it I actually got 16.2 is well, I think its because you're meant to use N not N-1 or there's a mistake :L

At the end of 2014 the values above 500, however at the end of 2015 its bellow, so it probably went down in value in the middle?

confused now, the edexcel standard papers are okay but these ones are weirdly worded! :confused:

(edited 10 years ago)

Reply 981

justinawe

Original post by tigerz

Yeah when I tried it I actually got 16.2 is well, I think its because you're meant to use N not N-1 or there's a mistake :L

confused now :confused:

The question was unclear, see my previous post.

Reply 982

tigerz

Original post by justinawe

The question was unclear, see my previous post.

Ahh yeah, thank you :P

Reply 983

Xx4L3x

How do you work out percentage change for Integration????????

Reply 984

justinawe

Original post by Xx4L3x

How do you work out percentage change for Integration????????

What?

Just calculate the percentage change... (new value - old value)/old value * 100%

Reply 985

Xx4L3x

That;s what I did....

new value = 6 + 28root 2

old value = 45.4

So I should divide by 45.4.

But the mark scheme divides by 6 + 28root 2

Reply 986

Xx4L3x

The question is from C2 Soloman C Question 9

http://www.tomred.org/uploads/7/7/8/3/778329/c2_qp_solomon_c.pdf

45.4 is from the trapezium rule

6 + 28root 2 is exact value

Reply 987

tigerz

Original post by Xx4L3x

The question is from C2 Soloman C Question 9

http://www.tomred.org/uploads/7/7/8/3/778329/c2_qp_solomon_c.pdf

45.4 is from the trapezium rule

6 + 28root 2 is exact value

isnt it just: 6+28root2-45.4/ (6+28root2) *100= 0.43%

(edited 10 years ago)

Reply 988

tigerz

Original post by Xx4L3x

That;s what I did....

new value = 6 + 28root 2

old value = 45.4

So I should divide by 45.4.

But the mark scheme divides by 6 + 28root 2

Heya, basically 6+28root2 is bigger than 45.4....Thats why you have to do it the other way round, also in this case the line is sloping upwards so has to be an overestimate! (sub in x=1 you get 4, when x=2 you get 6.24..)

Reply 989

justinawe

Original post by Xx4L3x

The question is from C2 Soloman C Question 9

http://www.tomred.org/uploads/7/7/8/3/778329/c2_qp_solomon_c.pdf

45.4 is from the trapezium rule

6 + 28root 2 is exact value

What I said was correct, if we were talking about percentage change (which is what you said).

The question here is asking for percentage error. There's a difference.

\mathrm{Percentage \ error} = \dfrac{ \mathrm{Approximate \ Value} - \mathrm{Exact \ Value} }{ \mathrm{Exact \ Value} }

Reply 990

mynameisntbobk

Which C2 paper do people think is the hardest? I need a challenge, because the recent ones aren't that that hard

Reply 991

trouducul

Original post by Xx4L3x

I dont understand this logs question:

Solve the equation
4 ^ x− 3 ( 2 ^ ( x+1 ) ) = 0.

4 ^ x− 3 ( 2 ^ ( x+1 ) ) = 2^(2x) - 3( 2*2^x)= 2^(2x) - 6*2^x

t= 2^x

t^2 - 6t=0

t(t-6)=0

t=0 or t=6
2^x=0.....or.....2^x=0
invalid............ log(2^x)=log(6)
.....................x*log(2)=log(6)
.....................x=log(6)/log(2)

x=2.58

Ain't I right? :smile:

Reply 992

tigerz

Original post by mynameisntbobk

Which C2 paper do people think is the hardest? I need a challenge, because the recent ones aren't that that hard

Try the practice papers, some pretty difficult questions in there! I've got the attachments uploaded in an earlier post :smile:

page49 I think

(edited 10 years ago)

Reply 993

BearOfStown

Original post by mynameisntbobk

Which C2 paper do people think is the hardest? I need a challenge, because the recent ones aren't that that hard

Have you tried Solomon Papers?

Reply 994

mynameisntbobk

Original post by BearOfStown

Have you tried Solomon Papers?

I've done a few, pretty standard so far, nothing too tricky yet, then again, I've only done the first 3

Original post by tigerz

Try the practice papers, some pretty difficult questions in there! I've got the attachments uploaded in an earlier post :smile:

page49 I think

Ah right, thank you :smile:

Reply 995

BearOfStown

Original post by mynameisntbobk

I've done a few, pretty standard so far, nothing too tricky yet, then again, I've only done the first 3

They are meant to get harder as you go through them, try some of the last ones :smile:

Reply 996

tigerz

Original post by mynameisntbobk

I've done a few, pretty standard so far, nothing too tricky yet, then again, I've only done the first 3

Ah right, thank you :smile:

No problemo :smile:

Reply 997

mynameisntbobk

Original post by BearOfStown

They are meant to get harder as you go through them, try some of the last ones :smile:

Alright, will do, thanks, kind of knew that as well, I' just put off solomon's because of S1 solomon's, but that's stupid haha

Original post by tigerz

No problemo :smile:

Found it

Post 971 I tried to rep you, but PRSOM

(edited 10 years ago)

Reply 998

tigerz

Original post by mynameisntbobk

Alright, will do, thanks, kind of knew that as well, I' just put off solomon's because of S1 solomon's, but that's stupid haha

Found it :smile:

Post 179 I tried to rep you, but PRSOM

Ahh its cool :smile:

Reply 999

jadecross

This probably sounds like a stupid question but instead of using binomial expansion formula can't we just use pascal's triangle and still get full marks?

(edited 10 years ago)

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