C4 Unofficial Mark Scheme June 2018 (Edexcel)

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physics_bro
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Much nicer than C3. Here are my answers.

Q1 Binomial: 2 -9/4 x -81/64 x^2
part b: x =0.1, 17.623
Q2 Partial fractions: A =-2 B=6 C=1
part b: -ln(2x+1) -3(2x+1)^-1 +ln(x+3)
Q3 Implicit differentiation: part a was algebra
part b: x =1+-rt2
Q4 Differential equations: 6/(2-tan2x)
Q5 Parametric: x= 6 - pi/2
part b: y = -4x +26 -2pi
Q6 Rate of change: 8/(3pi)
Q7 Vectors: angle was 4rt21/21 area was 12rt5
Q8 Volume of revolution: pi^3/64 +pi/16
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Kevin De Bruyne
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(Original post by physics_bro)
Much nicer than C3. Here are my answers.

Q1 Binomial: 2 -9/4 x -81/64 x^2
part b: x =0.1, 17.623
Q2 Partial fractions: A =-2 B=6 C=1
part b: -ln(2x+1) -3(2x+1)^-1 +ln(x+3)
Q3 Implicit differentiation: part a was algebra
part b: x =1+-rt2
Q4 Differential equations: 6/(2-tan2x)
Q5 Parametric: x= 6 - pi/2
part b: y = -4x +26 -2pi
Q6 Rate of change: 8/(3pi)
Q7 Vectors: angle was 4rt21/21 area was 12rt5
Q8 Volume of revolution: pi^3/64 +pi/16
Good job.

Join in the discussion here

https://www.thestudentroom.co.uk/sho...4#post78502004
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amalthelama
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hey can i see a worked solution for the differential equation question please. thank you
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physics_bro
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OK I'll dm you
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mr_shah
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(Original post by physics_bro)
Much nicer than C3. Here are my answers.

Q1 Binomial: 2 -9/4 x -81/64 x^2
part b: x =0.1, 17.623
Q2 Partial fractions: A =-2 B=6 C=1
part b: -ln(2x+1) -3(2x+1)^-1 +ln(x+3)
Q3 Implicit differentiation: part a was algebra
part b: x =1+-rt2
Q4 Differential equations: 6/(2-tan2x)
Q5 Parametric: x= 6 - pi/2
part b: y = -4x +26 -2pi
Q6 Rate of change: 8/(3pi)
Q7 Vectors: angle was 4rt21/21 area was 12rt5
Q8 Volume of revolution: pi^3/64 +pi/16

This is all very accurate and excellently organised. I looked at chillichamps' mark scheme which had unnecessary working out. This is clear, concise and straight to the point without any waffle. Thank you so much!
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Chillichamps
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The waffle ? The waffle is there so people who didn't just get top marks (like yourself most likely) have a chance to remember the questions. As far as I know I didn't even do any working out!

I don't think having a mark scheme without the questions is particularly helpful once you have got something wrong - having the question and what was required and given straight away helps
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student2647
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(Original post by physics_bro)
Much nicer than C3. Here are my answers.

Q1 Binomial: 2 -9/4 x -81/64 x^2
part b: x =0.1, 17.623
Q2 Partial fractions: A =-2 B=6 C=1
part b: -ln(2x+1) -3(2x+1)^-1 +ln(x+3)
Q3 Implicit differentiation: part a was algebra
part b: x =1+-rt2
Q4 Differential equations: 6/(2-tan2x)
Q5 Parametric: x= 6 - pi/2
part b: y = -4x +26 -2pi
Q6 Rate of change: 8/(3pi)
Q7 Vectors: angle was 4rt21/21 area was 12rt5
Q8 Volume of revolution: pi^3/64 +pi/16
Hey can I see a worked solution for q6 please
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Chillichamps
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(Original post by student2647)
Hey can I see a worked solution for q6 please
Sure, one sec
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mr_shah
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(Original post by Chillichamps)
The waffle ? The waffle is there so people who didn't just get top marks (like yourself most likely) have a chance to remember the questions. As far as I know I didn't even do any working out!

I don't think having a mark scheme without the questions is particularly helpful once you have got something wrong - having the question and what was required and given straight away helps
Most like myself?! I’ll have you know that most of my answers are in accordance with physics bros markscheme, whereas judging by your markscheme it seems that you will struggle to get into university this year.
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student2647
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(Original post by Chillichamps)
Sure, one sec
and 7e please thanks
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physics_bro
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(Original post by student2647)
Hey can I see a worked solution for q6 please
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Chillichamps
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(Original post by mr_shah)
Most like myself?! I’ll have you know that most of my answers are in accordance with physics bros markscheme, whereas judging by your markscheme it seems that you will struggle to get into university this year.
Well, that doesn't make much sense considering the final answers are the exact same for all the questions.
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Chillichamps
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(Original post by student2647)
and 7e please thanks
Ok
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student2647
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(Original post by physics_bro)
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Thank you so much
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Chillichamps
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https://drive.google.com/open?id=1Ca...a69E3QCYzS0r11
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mr_shah
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(Original post by Chillichamps)
Well, that doesn't make much sense considering the final answers are the exact same for all the questions.
The finer details are not pertinent. The point is that I was quickly and easily able to access and interpret physics bros markscheme without the **** format you used to accompany your waffle.
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physics_bro
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Why must you stick your nose in, he's asking me on my mark scheme for quick and easy to interpret solutions without the verbiage you love to input.
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Chillichamps
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Didn't mean to offend you, just that I couldn't see you had already posted your workings. Anyways, if you look at my actual paper the last word you would think of is 'verbage'
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physics_bro
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(Original post by Chillichamps)
Didn't mean to offend you, just that I couldn't see you had already posted your workings. Anyways, if you look at my actual paper the last word you would think of is 'verbage'
Judging from your illiteracy, it's a good thing you chose mathematics. Personally, your paper reflects your inability to lay down your thoughts in a concise manner. I would think that someone asking for help would appreciate a more simple walk-through. Why can't you just admit that you may be in the wrong?
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mr_shah
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THANK YOU!! This is exactly what I mean, your solutions are easy to follow for my friends that did not achieve top marks like me.
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