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Edexcel C4 June 2016 - Unofficial Markscheme

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for Question 6, on the prove that the integral = k (integral) sin^x i got 1/8 (integral) sec^2x.

Where did i go wrong??

and how many marks would i get for part B for carrying the k = 1/8 instead of using k=8?

Reply 81

edothero

Original post by Sapereaude54

Lol, lost all 5 marks on that question...shame
Also for the value of lambda that I obtained was 32, I know this is wrong know but everything else I got was correct.
Do you think the error will be carried forward to the next question.

I believe this was the last question on the paper,
Also, can you edit your comment and add: [ /spoiler] (without the space on the second one) around my working out please?

Reply 82

captainslow69

what UMS is 71 or 72 /75 going to be for this?

Reply 83

edothero

Original post by Student403

Interesting.

I wrote because mod l2's direction = 5sqrt2 and we want lengths of +-2sqrt2, then we must multiply the line equation direction by factors of +-2/5

I guess that works aswell? Was you able to get the required answers?

Reply 84

Sapereaude54

Original post by edothero

I believe this was the last question on the paper,
Also, can you edit your comment and add: [ /spoiler] (without the space on the second one) around my working out please?

Sorry for the confusion, I meant the lambda value integration question.

Reply 85

Student403

Original post by edothero

I guess that works aswell? Was you able to get the required answers?

Yeah of course. I came out of the exam wondering why that was worth 5 marks

Reply 86

riffy123

How many marks is q3? Differentiated it right but rearranged it completely wrong and therefore got part b entirely wrong.. how many marks would i lose?

Reply 87

captainslow69

Wasn't the volume question done by finding the volume under the big rectangle and taking it away from the volume under the curve?

Reply 88

hwilkoo

Will I get method marks for 8D) (Area question), if i had cos(theta)= -1/5 and that lead to the wrong area?

Reply 89

twigface

does anyone have the questions and/or workings|?

Reply 90

AJtheconfusedcat

Original post by Mattematics

Pretty sure every answer is now correct. Enjoy :smile:

Question 1:

Spoiler

Question 2:

Spoiler

Question 3:

Spoiler

Question 4:

Spoiler

Question 5:

Spoiler

Question 6:

Spoiler

Question 7:

Spoiler

Question 8:

Spoiler

for 8a if you write it in vector form u lose the mark because they asked for coordinates

Reply 91

coolguy123456

For the last one of last question did people get +- 2/5 for lamda?

Reply 92

Patrick Gekko

Original post by AJtheconfusedcat

for 8a if you write it in vector form u lose the mark because they asked for coordinates

thats not true, mark schemes usually accept either.

Reply 93

Jack2497

for Q7(c) I did :

Volume =pi X integral (between 17/2 and 1/2) 8 dx - pi X integral (between 17/2 and 1/2) y^2 dx

So for the volume of the cylinder the limits should have been 17/2 and 0 (not 1/2).
So my answer ended up being :

Volume = 544pi - 32pi - 1024pi/5

How many marks do you think I'll lose.

Overall though paper was decent. Only marks I think I lost were this one and last question on 8

Reply 94

edothero

Original post by Student403

Yeah of course. I came out of the exam wondering why that was worth 5 marks

It was odd to say the least.

Reply 95

k.russell

swear the 8c is 2 rt 2 not 2?

Reply 96

username2504271

If I put '10 hours and 33 minutes' for question 4, would I get all the marks? Thanks for the unofficial mark scheme by the way- really helpful :smile:

Reply 97