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# AQA A2 Mathematics MPC4 Core 4 - 9th June 2015 [Discussion & unofficial markscheme] watch

1. (Original post by Chloe<3)
Did anyone get the +c in the differential equation of 8a to be -4??

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Er, no I got it to be 1. I checked my answer afterwards (after I'd found x in terms of t) and it worked out...
2. How many marks do I lose if I incorrectly integrated (1/5)(t+1)^-2 to be -(t+1)^-1 (I forgot to add in the factor of 1/5) But then carried on with correct working, but obviously to get the wrong answer :/
3. The final answer was 3m, you are right

(Original post by kateyl)
I just got 3m, not one over
4. (Original post by AlexV63)
Unofficial mark scheme anyone? :-)
We have agreed that CD223 is writing the mark scheme, it should be up within the next hour or so
5. Was the Value for the constant in c 4
6. (Original post by jjsnyder)
How many marks do I lose if I incorrectly integrated (1/5)(t+1)^-2 to be -(t+1)^-1 (I forgot to add in the factor of 1/5) But then carried on with correct working, but obviously to get the wrong answer :/

I did exactly this !!!
7. (Original post by Hexaneandheels)
The final answer was 3m, you are right
yaaaaaassssssss
8. (Original post by Freyk2)
I did exactly this !!!
Saw it at the last minute and did not have time to change it :'( Think I would have done well if it wasn't for that as well! :'''''(
9. I think you integrated it, I did the same at first

To differentiate youd take the power of -1 down to -2
10. That was beautiful
11. Like 15 6 4 or some thing like that
(Original post by neymarFanboy)
what was the coordinates of C?
12. Who got -17/6 ln5 then For K?
Or was K 1/18??
Question 1b this was
13. (Original post by Harrylad)
Who got -17/6 ln5 then For K?
Or was K 1/18??
Question 1b this was
Got k=8/3, was pretty sure that one was correct
14. Did anyone else get 9 6 4 for C coordinates
15. (Original post by Harrylad)
Who got -17/6 ln5 then For K?
Or was K 1/18??
Question 1b this was
i got 8/3 ln 5
16. What was the cordinate for C?
I had fractions lool
17. (Original post by alikhaliq)
Like 15 6 4 or some thing like that
I got this as well
18. Was lander for vectors question part 2 equal to 4 and then just sub in??
19. Yeah it was inversely proportional to the area of a circle where you have to include constant of proportionality
20. I got 8/3ln5

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