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# Edexcel A2 C4 Mathematics June 2015 - Official Thread watch

1. Did anyone else just use a substitution on the last question? It made it so much easier.
2. For q8) i worked out the wrong gradient of the line, hence wrong coordinates and led to my part b) wrong, if i followed the right method can i get around 4/6 marks for b?
3. does anyone remember how many marks it was for the last part of q8?
4. (Original post by Paraphilos)
Unfortunately, it does; by C1 exponentiation laws.
I know. I was getting muddled up with someone previously saying it was 3 to the x squared. That is not what I meant at all. I removed the comment, hahaha I look like such an idiot, oops.
It's like saying 2 + 1 doesn't equal 3... oh dear...
5. (Original post by Paublo)
My answers for this paper were:
1) 2+5x/4-25x^2/64
3rt2/2
181/128
2)(2x-3y)/(3x+8y)=dy/dx
+-(24/5,16/5)
3)x=4ln(2)
12+32ln(2)^2-32ln(2)
4) A=5,1,3
p=15
31.82
d=7.46
5)27/32
a=2 b=-5
6)k=4
4pi/3 + rt(3)/2
7) 1/(p-2) - 1/p
0.473
8) x=2 - 1/ln3
area = 13pi/ln3
this is most of the questions that i wrote down my answers to, I am confident in most of them although I am prone to the occasional stupid mistake so if you disagree then I will not argue with you.
Exactly what i got. 75/75 whoz

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6. (Original post by Emmi12345)
I know. I've deleted the comment now. I was getting muddled up with someone making it 3 to the x squared. I look like an idiot now hahaha.
Not anymore. You looked like one for a moment though. Jokes.
7. (Original post by NJ4769)
I agree with all of these.
Would it matter if you wrote 26pi/2ln3 ??

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8. (Original post by Ripper Phoenix)
just because u saw ur answer in someones answers doesnt make it a mark scheme answer lol
13pi/ln3 is almost unanimous though!
The radius of the cone was 9, the height was 2 - (x-coord of Q), I think
9. (Original post by Ripper Phoenix)
just because u saw ur answer in someones answers doesnt make it a mark scheme answer lol
A lot of people agree on it though
10. 3c... Is that 32ln2 - 12 then after simplification? Since you've not put brackets it seems like +12 but I'm pretty sure I got - 12...not saying you're wrong. Just want to know for peace of mind
(Original post by PaulCJH)
My answers, judging by other people's opinions I think they're right:
Attachment 429779
11. vote and see estimated boundaries at
http://www.thestudentroom.co.uk/show....php?t=3407637
12. (Original post by Fanta4TheBanter)
Did anyone else just use a substitution on the last question? It made it so much easier.
I was going to but ran out of time
13. (Original post by V0ldemort17)
Would it matter if you wrote 26pi/2ln3 ??

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Probably not.
14. (Original post by Disney0702)
You have to get a minimum of 180 UMS across BOTH C3 and C4.

So you could score 95 UMS in C3 and 85 UMS in C4.

And on top of that you need to get a minimum of 480/600 UMS in your whole A Level.

Thank you!! that helps!
15. (Original post by tawaz1997)
Sorry but there's some wrong answers on there
16. (Original post by Paublo)
My answers for this paper were:
1) 2+5x/4-25x^2/64
3rt2/2
181/128
2)(2x-3y)/(3x+8y)=dy/dx
+-(24/5,16/5)
3)x=4ln(2)
12+32ln(2)^2-32ln(2)
4) A=5,1,3
p=15
31.82
d=7.46
5)27/32
a=2 b=-5
6)k=4
4pi/3 + rt(3)/2
7) 1/(p-2) - 1/p
0.473
8) x=2 - 1/ln3
area = 13pi/ln3
this is most of the questions that i wrote down my answers to, I am confident in most of them although I am prone to the occasional stupid mistake so if you disagree then I will not argue with you.
thankyou for this :-) I'm impressed with your memory hahaha

(Original post by Fanta4TheBanter)
Did anyone else just use a substitution on the last question? It made it so much easier.
me !!!
Let u = 2x
etc etc

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17. If I got k as 2 and so continued with it through many marks would I lose out of the total 8?

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18. (Original post by physicsmaths)
Exactly what i got. 75/75 whoz

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How many marks would I lose for getting the wrong value of X for Q? I got the correct equation and correct integration for b, but got the x co word wrong which will also have affected my cone? I am thinking 4?
19. Anybody remember what question 3c asked?
20. If you get the answer right, do you automatically get all the marks?

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