You are Here: Home

# C1, OCR MEI - 16/05/12 (Answers) Tweet

Maths exam discussion - share revision tips in preparation for GCSE, A Level and other maths exams and discuss how they went afterwards.

Announcements Posted on
TSR launches Learn Together! - Our new subscription to help improve your learning 16-05-2013
IMPORTANT: You must wait until midnight (morning exams)/4.30AM (afternoon exams) to discuss Edexcel exams and until 1pm/6pm the following day for STEP and IB exams. Please read before posting, including for rules for practical and oral exams. 28-04-2013
1. C1, OCR MEI - 16/05/12 (Answers)
Hey, this is what i got for C1 MEI today.

any discussion/corrections are welcome!

PHP Code:
``` 1. y=-2x+7 and (0,7) and (7/2,0)2.[b] = SQRT(3a/2c)3. i) 25    ii) 4/94. (x-3)/(x+2)5. i) 30   ii) 8/116. i) 10   ii) -720 (x^3)7. -SQRT(5) < K < SQRT(5)8. b= -4 c= -89. 6n+9 Show that it is always odd and n must be a multiple of 3 for (6n+9)/910.i) SQRT(20) = SQRT(20) QED    ii)1/3 * -3 = -1 QED    iii) Midpoint AC: (2,2)   Found they intersect at (2,2) and not (5,3) 11.i) 2x^3 - 5x^2 - 23x - 10    ii) Cubic graph drawn correct way up passing through -2, -0.5 and 5    iii) (0,-18)    iv) (0,-40)12.i) (4,1) (2.6,-2.6) (0.4,-0.4) give or take 0.1 ish     ii)Showed     iii) x= (3+SQRT(5))/2 and (3-SQRT(5))/2  ```
Last edited by Jack:); 16-05-2012 at 21:02. Reason: 9
2. Re: C1, OCR MEI - 16/05/12 (Answers)
Mate your question 8 is wrong. It was b = -4, c = -8.
3. Re: C1, OCR MEI - 16/05/12 (Answers)
(Original post by Axion)
Mate your question 8 is wrong. It was b = -4, c = -8.
Yes, sorry i forgot to make the second equation equal to 85
4. Re: C1, OCR MEI - 16/05/12 (Answers)
(Original post by Jack:))
Yes, sorry i forgot to make the second equation equal to 85
lol you remember all of that?
5. Re: C1, OCR MEI - 16/05/12 (Answers)
(Original post by Axion)
lol you remember all of that?
Yep, it’s a shame my pre-exam memory is not that good!
Oh well, it’s only 3 marks tops and hopefully i get a nice examiner and i get a mark for knowing to use simultaneous equations.
6. Re: C1, OCR MEI - 16/05/12 (Answers)
(Original post by Jack:))
Yep, it’s a shame my pre-exam memory is not that good!
Oh well, it’s only 3 marks tops and hopefully i get a nice examiner and i get a mark for knowing to use simultaneous equations.
Don't worry I know I've lost about 7-8 marks already from stupid mistakes
7. Re: C1, OCR MEI - 16/05/12 (Answers)
(Original post by Axion)
Don't worry I know I've lost about 7-8 marks already from stupid mistakes
Thats the biggest problem with C1, its so easy to make mistakes, i am thinking that the grade boundries will be quite high tho, 60 for an A
8. Re: C1, OCR MEI - 16/05/12 (Answers)
(Original post by Jack:))
Thats the biggest problem with C1, its so easy to make mistakes, i am thinking that the grade boundries will be quite high tho, 60 for an A
For the first one, do we need to write the coordinates of the point where it crosses the axis? I didn't see that -3 from me .
9. Re: C1, OCR MEI - 16/05/12 (Answers)
HA just got so worried because I didn't recognise ANY answers.. I don't do MEI!
10. Re: C1, OCR MEI - 16/05/12 (Answers)
So much love for this. Thank you ever so much
11. Re: C1, OCR MEI - 16/05/12 (Answers)
How can you remember all this, geeeeeeeeeeeeeeeeeeeee
12. Re: C1, OCR MEI - 16/05/12 (Answers)
(Original post by steven hawking)
How can you remember all this, geeeeeeeeeeeeeeeeeeeee

Lol
13. Re: C1, OCR MEI - 16/05/12 (Answers)
(Original post by tehforum)

Lol
14. Re: C1, OCR MEI - 16/05/12 (Answers)
I have an issue with your question 11, if you take the original factorised form of (x+1/2)(x+2)(x-5) then the y intercept would be -5 not -10. I put the equations 2x^3 -5x^2 -23x -10 and the expanded form of the factorised equation into autograph and they aren't the same. So to get from the factorised equation to one with a coefficient of 2, you can't just double everything or I believe you get a false y intercept (but no idea how you actually get there).

So if I'm correct, the answer for the y intercept of f(x) -8 is (0, -13) and the answer to f(x-3) is -20?
15. Re: C1, OCR MEI - 16/05/12 (Answers)
Oh and 11ii was to draw the graph of f(x)
16. Re: C1, OCR MEI - 16/05/12 (Answers)
(Original post by Stephybob)
I have an issue with your question 11, if you take the original factorised form of (x+1/2)(x+2)(x-5) then the y intercept would be -5 not -10. I put the equations 2x^3 -5x^2 -23x -10 and the expanded form of the factorised equation into autograph and they aren't the same. So to get from the factorised equation to one with a coefficient of 2, you can't just double everything or I believe you get a false y intercept (but no idea how you actually get there).

So if I'm correct, the answer for the y intercept of f(x) -8 is (0, -13) and the answer to f(x-3) is -20?
If i'm not mistaken they asked us to put the original factorised form into the form which starts 2x^3 and then to solve from there, so I think the answer's -40 as a result..

Hope it helps
17. Re: C1, OCR MEI - 16/05/12 (Answers)
how did everyone find it
18. Re: C1, OCR MEI - 16/05/12 (Answers)
(Original post by Stephybob)
Oh and 11ii was to draw the graph of f(x)
19. Re: C1, OCR MEI - 16/05/12 (Answers)
(Original post by thesaintx)
If i'm not mistaken they asked us to put the original factorised form into the form which starts 2x^3 and then to solve from there, so I think the answer's -40 as a result..

Hope it helps
Hmm you're probably right but seeing as both are f(x) then it shouldn't matter which one you use if they equal the same thing? As both should give the same y intercept? Unless they wanted us to find g(x) or something which has the same roots as f(x) but a different intercept?
20. Re: C1, OCR MEI - 16/05/12 (Answers)
(Original post by cloudhang)
how did everyone find it
Judging on previous papers my geuss would be 63 Max and 58 Min but personally im thinking around 61. Of course it is hard to tell
Useful resources

## Articles:

Study Help rules and posting guidelinesStudy Help Member of the Month nominations

## Groups associated with this forum:

View associated groups