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# Ocr (not Mei) Core 2 Answers January 2010 watch

1. (Original post by jkkk32)
5 = 3x^2 - 4x + 1
3x^2 - 4x - 4 = 0
(3x+2) (x-2)
3x+2=0
x = -2/3
and x = 2??
thats what i posted earlier, 2would work though??
2 is wrong as the point you were given (2, 5) and you were told to find the other one where y = 5.
2. (Original post by jkkk32)
-2/3 wouldnt work? but 2 would! can someone confirm this or am i calculate illiterate
I thought this too. But i think it had to be -2/3 because the x coordinate of the other one was 2.
3. (Original post by rubberdam123)
the co-ordinate was (P,5), not (5,P), you put y as 5 and solve with quadratic equation, so p = 2. defo!
4. ok thanks
5. (Original post by Mr M)
How were the marks for this arranged? I think I made a simple arithmetic error right in the beginning and that may have caused me the whole answer wrong. Thanks so much Mr M for this! Really appreciate you doing this.
6. (Original post by JChoudhry)
How were the marks for this arranged? I think I made a simple arithmetic error right in the beginning and that may have caused me the whole answer wrong. Thanks so much Mr M for this! Really appreciate you doing this.
One mark for integrating between 1 and 3.

Two marks for correctly integrating the first curve.

Two marks for correctly integrating the second curve.

Two marks for subtracting them (either before or after the integration).
7. has anyone got the question paper?
8. (Original post by mrdude)
crap i just realised i got very different answers for 6. i got a=15 and b=32.
when I substituted these values back in i got the correct answers
did anybody else get that?
please tell me somebody else got this? don't wanna throw away 6 easy marks and possibly say goodbye to an A
9. (Original post by Mr M)
Collected paper at 15:25 and answers were posted at 15:56 so I was superspeedy (I used a computer for the binomial expansion and the trapezium rule though so I cheated slightly).
Woah, Mr.M. You're something of a Ferrari! Also thanks for the answers

It looks like I got full marks, (or close to- I can't remember what I said for some Qs)
10. Mr M. can you do the last question, the logs one, i started the question, but I couldnt prove it.
11. (Original post by mrdude)
please tell me somebody else got this? don't wanna throw away 6 easy marks and possibly say goodbye to an A
No they are wrong I'm afraid. You might get method marks. What did you do?
12. (Original post by Mr M)
No they are wrong I'm afraid. You might get method marks. What did you do?
agh I'm trying to remember the question. I know I entered in the factors given and got two simultaneous equations and from there found the values of a and b. Must've just made a silly mistake somewhere along the way and not noticed. So, because I used the right method, how many marks would I get for that?
13. (Original post by Mr M)

what I don't understand is

there was p = -2/3 and p=2

both work when you put in equation, which one is right? and how would you know?
14. if you use pascals triangle on the coefficient question you get 35 x 2^4 x (-1/4)^3 = -35/4
15. (Original post by crazyness)
what I don't understand is

there was p = -2/3 and p=2

both work when you put in equation, which one is right? and how would you know?
you were already given that (2,5) is on the curve, therefore p must equal -2/3
16. (Original post by crazyness)
Mr M. can you do the last question, the logs one, i started the question, but I couldnt prove it.

17. (Original post by crazyness)
what I don't understand is

there was p = -2/3 and p=2

both work when you put in equation, which one is right? and how would you know?
I explained this a few posts ago. p = 2 was given in the question and they asked you to find another "distinct point".
18. (Original post by mrdude)
you were already given that (2,5) is on the curve, therefore p must equal -2/3
I left it as p = 2 or p = -2/3
would i get any marks?
19. (Original post by mrdude)
agh I'm trying to remember the question. I know I entered in the factors given and got two simultaneous equations and from there found the values of a and b. Must've just made a silly mistake somewhere along the way and not noticed. So, because I used the right method, how many marks would I get for that?
You might get as many as 4 out of 6.
20. (Original post by crazyness)
I left it as p = 2 or p = -2/3
would i get any marks?
2 out of 3 (you might even get all 3 if the mark scheme is generous).

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