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# Edexcel A2 C4 Mathematics June 2015 - Official Thread Watch

1. (Original post by ahb123)
I've emailed edexcel as integrating 3^x is not explained in the textbook so they shouldn't really ask a question on it!
it says if y=a^x , dy/dx = a^x lna
dont chat
3. (Original post by ahb123)
I've emailed edexcel as integrating 3^x is not explained in the textbook so they shouldn't really ask a question on it!
omgg exactly! had a massive go at my teacher for no teaching us that but its not even on the specification! wtf
4. For 8 d when subbing the values in I said 3^0= 3 instead of 1. Everything else in the integration was right and if I put it equals 1 I would have got the right answer. (I used the integral = 3^(2x)/(2ln3) ). How many marks would I lose for this? would it be possible to still get 100 ums?
5. Stats: 74 Ums (already done)

Raw marks:
C1: 65-68
C2: 70-72
M1: 50-60
C3: 55-62
C4: 61-66

Maaan, getting that A is gonna be close :/
6. (Original post by jackw220697)
C1: 87 ums
C2: 83 ums
C3:62/75
C4: 52/75
D1: 65/75
S1: 74 ums
Anyone have any idea what this would be? thanks
http://umstools.sourceforge.net/demo...tor&target=gce
7. (Original post by swagprincess)
omgg exactly! had a massive go at my teacher for no teaching us that but its not even on the specification! wtf
It's in the formual book (as shown below) and then u just use chain rule.

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8. (Original post by swagprincess)
omgg exactly! had a massive go at my teacher for no teaching us that but its not even on the specification! wtf
It is on the spec, you could integrate it by substitution or by parts, very do-able
9. Hi anyone who will respond

I think I have achieved 67 in C3 and 69 in C4 (both 2015).Is this likely to be an A*? (I need A* in maths for my offer)

also how many marks will I lose - on 7c I got Sin2t= 2ln(3/2) but me being daft forgot my calculator was in degrees and ended up with 27.something years???

Thanks!
10. Ahhh guys i had a migraine and really messed up this paper, does anyone know what UMS 27/75 will roughly be?
11. (Original post by AlexObertan)
Ahhh guys i had a migraine and really messed up this paper, does anyone know what UMS 27/75 will roughly be?
if the boundary is in your favour, might pull off 40%. what do you need for maths anyway?
12. Would 67 in C3 and 65 in C4 scrape me an A*?
13. Hi guys, I think I did ok but made a really silly mistake on the last qu, I forgot to put the pi in front of the integral when finding the volume; apart from this I got everything in that qu correct, how many marks do you think I'd lose?
Also if I got 66/75 in c3 and around 70 to 72 in c4 is that enough for an A*?
14. (Original post by saycheese:))
if the boundary is in your favour, might pull off 40%. what do you need for maths anyway?
Thanks! Need a B for maths, which after today looks unlikely
15. Does anyone know how many marks would you need for pass?...
16. (Original post by AlexObertan)
Thanks! Need a B for maths, which after today looks unlikely
you might still get it depending on what you got for the rest though
17. (Original post by rohan1811)
shut up you weasely c unt
18. Why do I seem to be the only one who didn't get many answers and felt this paper was worse than the c3 one? I needed an A for uni but it looks like I'll be getting a B or a a C
19. After taking 10 mins to understand the "Math error", Arsey had to put a little note to himself in the mark scheme saying "READ THE QUESTION", what a legend

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