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Edexcel A2 C4 Mathematics June 2016 - Official Thread

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This initially confused me too! Think I got pi/3 in the end, because this value worked for both the x and y equations and pi/6 only worked for the y equation

If you sub π/3 in both the x and y parametric equation, you got the coordinates they gave. I too got a bit confused on that but that was reassuring to see

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Reply 4461

twigface

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 4462

I feel myself

Original post by Nightinwind

can anyone help me out!
72/75 c3
65/75 c4
is that likely to be an a*?/ what ums would each get me?

should be 95+84 so a high A

Reply 4463

ravichauhan11

Original post by togerel

For the last part of the last question, where you had to calculate the coordinates of E, lambda was 2/5 or -2/5, right? Did we then have to plug our values for Lambda into the equation of l2?

yep

Reply 4464

Bigboss27

Original post by tiriol

This initially confused me too! Think I got pi/3 in the end, because this value worked for both the x and y equations and pi/6 only worked for the y equation

I found this aswell but i used pi/6 so will i lose most marks for that whole question

Reply 4465

togerel

Original post by sztirmzi

Yeah! this is what i got and yes you were supposed to put it in l2 :smile:

I hope you did

Yes, I did do this :smile:

Thanks for the clarification!

Reply 4466

twigface

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

Does anyone know where I went wrong?

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

Reply 4467

Matteus3

If anyone has decent markshemes for C3, D1 or C4 could you post them? I haven't minded any of them but I've lost so many marks due to running out of time on all of them and I need to work out the chances of me getting the grade I need based on what I did answer. Also ****ed up all the other units but got 236/300 UMS last year so only need 184 from these papers.

Reply 4468

WillRose

for co-ordinates of E did anyone get (-3,12/5,9/5) and (-7,28/5,21/5) ?

i worked out how long one "gradient" was which a 5root2 , then the length from P to E which i got a 2root2 then used unit vectors/compared to work out the points

(edited 7 years ago)

Reply 4469

Engineerrookie

I got about C3 68-70
And C4 68-69

Do you think this could get me an A*???

Reply 4470

username1971317

Original post by Student403

I remember you from Cam/Imperial threads :smile:

Good to see you again! Hope you're going solid with your offers

Yeah! I remember you. I hope you are solid with your offers as well. I think I am going to end up in Imperial after that STEP exam for Camb as long as I don't mess up my alevel exams. Good luck for results day :smile:

Reply 4471

togerel

Original post by ravichauhan11

yep

Thanks!

Reply 4472

Student403

Original post by sztirmzi

Thanks! Imperial is still world class - you should be proud :biggrin:

Good luck to you too!

Reply 4473

Michaelj99

Original post by shahkr

How many marks do you think you will get for 1024/5pi? I did that too

I think we'll lose 1/2 marks

Reply 4474

The_Big_E

Original post by Lia_Fletcher

hey guys, i made some really stupid mistakes and think i only got 64/75 on C4. if i also got about 71/75 on C3 whats the likelihood of this being A*?

For an A* you need 480/600 UMS and 180+ between c3 and c4. Depending on the difficulty of the papers and the UMS conversions, 71/75 in C3 and 64/75 in C4 could get you an A* provided that you have the required 480 UMS too.

For an A* on average, you need approximately 136/150 raw marks across C3 and C4 combined, but this number may vary.

Reply 4475

math42

Original post by Engineerrookie

I got about C3 68-70
And C4 68-69

Do you think this could get me an A*???

yeah probs just over 90 in C3 and maybe 90 or just under in C4 (didn't sit them but seen C3 and judging by people's reactions to C4)

Reply 4476

Dhaal

Original post by douglasaa

What did everyone get for question 9) I got y = 32(1 + ln(x))^2

There was NO question 9, think you did the wrong paper.

Reply 4477

Student837621

Original post by Dhaal

There was NO question 9, think you did the wrong paper.

LOL!

Reply 4478

alexandrahowes

Does anyone remember a question 6a BEFORE the graph apparently? Hmmm

Reply 4479

Emma_Lewis0303

Original post by Kay Fearn

For the decay question did anyone get t = 640

so 640 x 24 x 60 = answer in minutes?

For the last area did anybody also get 6 units^2 ?

Found the paper ok, some tricky questions but only thing i think i may have got wrong fully was the very last question.

I found the distance of the direction vector and said linda = 1

then i used the vector equation P +/- linda(direction vector) to get the two co-ordinates of B. I didn't have enough time to finish it but i knew the methodology so hope i got a few marks for it. one of the B co-ordinates i got was -4i +9j +5k

I did the same thing as you on the decay question because did integral(-5/2x)dx = integral(1)dt instead of integral(1/x)dx = integral(-2/5)dt
Very annoying because that question was 7 marks :frown: