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# Mr M's OCR (not OCR MEI) Core 1 Answers May 2013 Watch

1. (Original post by Mr M)
No, that's fine.
for the decreasing function one I found dy/dx = 4x -1 but didn't make dy/dx zero...

then found the 2nd derivative after that and for some reason put X < 4 how many marks would I lose for this?
2. For 5ii) I put ( (2/x) + 5)^2
Is that completely wrong?
3. have you got the questions?
4. For 8, I got one of the midpoints wrong but the other one right. I then got the gradient of both the line and the perpendicular correct. However when i therefore substituted in my values, I got 3x + y - 2 = 0 . How many marks would I get? Thanks
5. Did anybody else get 10(ii) as a maximum? or was it just me
6. For question 9 i worked out all the points that it intersects but i only wrote next to where it crosses an axis like -3/2, -6 and 2. Would i get the marks?

PS - Thanks for the answers!
7. (Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 1 Answers May 2013

1. (i) (2 marks)

(ii) (1 mark)

(iii) (1 mark)

2. or (5 marks)

3. (i) (3 marks)

(ii) (2 marks)

4. (i) (3 marks)

(ii) (3 marks)

(iii) (2 marks)

5. (i) Correct sketch (2 marks)

(ii) (2 marks)

(iii) Stretch scale factor parallel to y axis (2 marks)

6. (i) Centre and radius (3 marks)

(ii) (2 marks)

7. (i) (2 marks)

(ii) (5 marks)

8. (7 marks)

9. (i) Correct sketch with intersections at (-1.5, 0) and (2, 0) and (0, -6) (5 marks)

(ii) OR (either will be marked correct) (3 marks)

(iii) (4 marks)

10. (i) (7 marks)

(ii) Minimum (2 marks)

(iii) (5 marks)

I'll be around to answer questions shortly.
Mr M, For question 9iii, not too sure what I did but I ended up with co-ordinates (1/4 , 4) any idea how many marks I'll lose?

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8. Hi Mr M,

For Q 9)iii I believe I got the x-coordinates correct but for some silly reason got the incorrect y-coordinates and hence got the Distance incorrect. How many marks should I expect to lose?

Also, for 10)iii I got the x-coordinate of -2 correct but inserted it into the wrong equation and got -43 for the y-coordinate. How many marks should i expect to lose?

Thanks for the effort
9. (Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 1 Answers May 2013

1. (i) (2 marks)

(ii) (1 mark)

(iii) (1 mark)

2. or (5 marks)

3. (i) (3 marks)

(ii) (2 marks)

4. (i) (3 marks)

(ii) (3 marks)

(iii) (2 marks)

5. (i) Correct sketch (2 marks)

(ii) (2 marks)

(iii) Stretch scale factor parallel to y axis (2 marks)

6. (i) Centre and radius (3 marks)

(ii) (2 marks)

7. (i) (2 marks)

(ii) (5 marks)

8. (7 marks)

9. (i) Correct sketch with intersections at (-1.5, 0) and (2, 0) and (0, -6) (5 marks)

(ii) OR (either will be marked correct) (3 marks)

(iii) (4 marks)

10. (i) (7 marks)

(ii) Minimum (2 marks)

(iii) (5 marks)

I'll be around to answer questions shortly.
MR M, what was question 7ii and how did you go about it? If I can remember correctly I found the min point using dy/dx and then just said x<min point (cannot remember co-ordinate).

I appreciate you putting up these answers

Posted from TSR Mobile
10. Mr. M, if I did all the correct workings for 10i but got k = 4, then did all the correct workings for 10iii but then got the wrong coordinates, how many marks would I lose? Would I get all the marks for ECF, or if not, how many would I lose?
11. Or does anyone else know what question 7ii was and how it was done?

Posted from TSR Mobile
12. Can someone please explain this to me (ii) (5 marks) , I think I got that and then changed it to x>0 or x<5 , how many marks will I lose?
13. (Original post by Majeue)
Im guessing you probably got the wrong value of k like me. The correct value of k was -5
I got k=-5 but got the same co-ordinates
14. could you maybe take a photo of the paper and post it?
15. what was 6ii and 9iii I forgot the questions
16. Damn it, lost a lot of marks here. So disappointed with myself especially with everyone on here saying it was an easy paper Time to pick myself up for C2!
17. Does anyone have the actual paper/questions?
18. (Original post by Wowzerss)
Or does anyone else know what question 7ii was and how it was done?

Posted from TSR Mobile
(2x-4)(x-3) </= 12
2x^2 - 4x - 6x +12 </= 12
2x^2 - 10x </= 0
x^2 - 5x </= 0
x(x-5) </= 0
x = 0 or x=5

draw inequality curve. as it is less than zero its the part of the curve below the x axis.
so 0</= x </= 5
19. (Original post by roar96)
How many marks do you reckon i'll get for question 2 for putting y=x^2 doing that to get something to the power of 4, then putting z=y^2 and then getting a quadratic to work out x from there? I know it was stupid and wouldnt actually end up calculating it for ^6, I had one of those blank moments... but i did use the substitution method...
Sorry but I don't think that will gain any credit.
20. (Original post by Goods)
please you tell me How many marks would be lost for not discounting the (0,-9) co-ordinate in 10iii)
Just 1 I expect.

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