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

1. What do you think my marks will be, if I got the wrong value for k. But my method for that and the rest of question 10 were correct but obviously my answers would have been wrong. ( I Got the wrong value for k as I STUPIDLY multiplied -3 and 9 to get....-18. Giving k=4) ECF?
2. (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.
do you have the questions to the paper
3. (Original post by StephHowarth)
For question 2, i put 8^-1/3
Will I still get the mark? I don't know why I wrote it so weirdly, but it is technically still right isn't it?
It is technically still right. I think that is probably ok.
4. Out of curiosity, for the transformations questions, would I still get 2 marks if i said:

"stretch scale factor 1/2 in the y direction"? As opposed to parallel to the y axis?
5. (Original post by Mr M)
No that's fine.
thank you!!
6. (Original post by BankOfPigs)
Out of curiosity, for the transformations questions, would I still get 2 marks if i said:

"stretch scale factor 1/2 in the y direction"? As opposed to parallel to the y axis?
Yes.
7. Mr M,

1) If we expanded the brackets after transforming the graph -5 units in the x-axis (Question 5, ii.) would we lose any marks, bearing in mind I did write the bracketed form out before expanding it? and the expansion was correct, (x+5)^2=x^2+10x+25

2) Could anyone give me the questions for 8 or 9?
8. (Original post by Mr M)
Lose 1 mark in part (i) and 1 or 2 in part (iii).
Thankyou, i was worried i was going to lose about 6
9. (Original post by hayhayhay1)
do you have the questions to the paper
Yes but I'm not typing them all in!

I can't scan them as that is a breach of OCR copyright.
10. (Original post by Mr M)
No that's fine.
for the complete the square question I left it as 39/12 instead of 13/4 please say you don't lose a mark for not simplifying?
11. (Original post by Mr M)
It is technically still right. I think that is probably ok.
Great thank you
12. Question 6i 2(10)^0.5 vs (40)^0.5 lose a mark for non simplified surd form for the circles radius?
13. (Original post by Cowcat)
What do you think my marks will be, if I got the wrong value for k. But my method for that and the rest of question 10 were correct but obviously my answers would have been wrong. ( I Got the wrong value for k as I STUPIDLY multiplied -3 and 9 to get....-18. Giving k=4) ECF?
Well you will lose one in the first part and 1 or 2 marks later on.
14. (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, I expanded, differentiated, subbed in -3 and ended up with K=-9 for some reason, must have been a slight arithmetic mistake, how many marks would I lose?

Posted from TSR Mobile
15. im guessing i got around 63 which is what i got in january hopefully ums will be higher than jan though
16. any suggestions on why for the last part of question 10 i got (1,0)?! I differentiated the equation given then equated it to 9 assuming they would have the same gradient, as y=9x-9 was the tangent to the curve. lots of questions, sorry!
17. For 5ii) I wrote (2/x+5)^2
Have I lost all the marks?
18. (Original post by Mr M)
Yes but I'm not typing them all in!

I can't scan them as that is a breach of OCR copyright.
why cant you type them up, as i cant remember half of them. sorry for the inconvenience
19. Mr M,

For the last question I got two coordinates for A instead of 1 , I got (0,-9) and (-2,-27)(the right answer) how many marks do you think I lost?
Thanks!
20. (Original post by ZachM)
Mr M, I expanded, differentiated, subbed in -3 and ended up with K=-9 for some reason, must have been a slight arithmetic mistake, how many marks would I lose?

Posted from TSR Mobile
1 for accuracy and maybe more if any other part of your working was wrong.

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