Edexcel A2 C4 Mathematics June 2016 - Official Thread

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How much will I lose for;
getting lamda +- correct but had to rush so wrote one of my numbers in E coordinates wrong
didnt do trapezium rule to correct SF
did Cylinder with right volume, got the right integral with limits. I did the taking away right but I got a weird and incorrect answer.

So annoyed at my really silly lost marks in this and C3 will probably not get an A* cos of it

(edited 7 years ago)

Reply 4321

k.russell

Original post by HoldtheDoor

How many marks was that question?

I am thinking 3? Not 100% tho you'll probs only be -1, if that dw

Reply 4322

Jacob2215

Original post by Dec1307

For the volume I got volume=554pi -1204pi/5 = 1696pi/5 ??

Posted from TSR Mobile

I got this!

Reply 4323

Mattematics

http://www.thestudentroom.co.uk/showthread.php?t=4184191

Reply 4324

boylubda

What was the answer to 6ai the partial fractions integration!!?

Reply 4325

Lewi348

Original post by hhhbmnb

ez 75/75 thank you everyone for lowering grade boundaries

Thank you for your useless comment

Reply 4326

Khoinet

Original post by toby22222

YOUR A ****

Eventhough i got full mark properly, i must say this yeah c4 is quite hard. Luckily i did further math. Expecting the grade boundary to be low.

Reply 4327

cookiemonster15

Original post by Danimtz

If you're talking about the integral with ^3/2
They gave you an integral to ^3/4 cause you had to do y^2 to find solids of revolution.

Wait, I did the intergral being ^3/2?

Reply 4328

RoosterJones

Original post by Patrick Gekko

1) (1/8)-(15x/16)+(75x^2/16)-(625x^3/32)

2) 0.6595 for missing value
1.083 for estimate
(8/3)ln2 -(7/9)

3) dy/dx= (-4xy-2)/(2x^2+4+piSinpiY)
X value was (3pi +62)/(pi+22)

4) X= 60e^-2.5t
633 mins nearest minute

5) (-5root3)/16
Q: (4,5root3)

6) not sure about A- partial fractions integration. 3ln(3y+2) -2lnY + c
Show substitution
(4pi/3) -root3

7) k was 8.5, volume was 1696pi /5

8) a was 3,5,0
K equals 2 (AP was 2root2)
Cos= 4/5
E was same as what others have said

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Got the exact same,except for the volume...i multipled that answer by 2 so was 3392/5
Not sure whether im xorrect though.

Reply 4329

StrongerinEU

Thought the exam went well but I'm so annoyed about Brexit that I don't even care.

Reply 4330

King:Fu

Original post by M3WIZARD

Can Someone verify if all of these are correct. I believe I got everything here - I just couldn't remember what the last term for Q1 was - but I distinctly remember the first 3 terms

Can confirm I got these answers.

Reply 4331

hongse123

Can anyone remember the original equation you had to differentiate for the normal question where the answer was like 62+pi/22+Pi? I ****ed it somehow and I want to know why

Reply 4332

d14m

Ok so no misprint? Sigh of relief, thanks.

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Reply 4333

Osalim1998

How much would it be if I didn't bring pi to the front of the derivative so I have just Dy/dxsin(piy)? I got part b wrong as well😞
I was thinking like 5-7?

Reply 4334

lfcrules

for the differential equatiion i just left it as 5t + ln 3600/x squared , and i ended up geting the next bit right , which means the equation must have been right . However i didnt do the e to the power of blah blah blah thingy , how many marks do you think ill lose. also do you think ill lose amrks for leaving it as 8/6 pi not 4/3 pi

Reply 4335

k.russell

Original post by M3WIZARD

Can Someone verify if all of these are correct. I believe I got everything here - I just couldn't remember what the last term for Q1 was - but I distinctly remember the first 3 terms