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# Mr M's OCR (not OCR MEI) Core 1 Answers May 2015 watch

1. For attempting to work out the discriminent will you get a mark. This is because i worked it out wrond as i got -23 (1-24) since i didnt times 4ac by -1. Thus i final answer was k>-23/8 (swapped signs due to dividing by -ve)
2. For question 7b)
I differentiated wrongly and ended up with a different power, and got the answer as -1/12. Do I get any marks?
3. For (5root5)^3 i wrote 5^5.5 because i did 5^2 x 5^3 x5^0.5 rather that 5^1 x 5^3 x5^0.5. could i still get 1 mark
4. Hi Mr M, thanks a lot for posting the answers. Relative to the past OCR C1 papers, how difficult do you think it stands? Would you say it would have higher grade boundaries like June 2014 or lower, for example 58 for and A?
5. If one of my y co ordinate is wrog bu t my working from then on is fine will i get 2/4
6. (Original post by ajamesg)
Is there any chance you could post the c1 paper?
It is copyright so I can't.
7. (Original post by Rubberduckiller)
For attempting to work out the discriminant will you get a mark.
Yes.
8. (Original post by czj1997)
For question 7b)
I differentiated wrongly and ended up with a different power, and got the answer as -1/12. Do I get any marks?
Yes. You'll probably get 2.
9. What was question 5ii) i cant remember the answer
10. (Original post by Rubberduckiller)
For (5root5)^3 i wrote 5^5.5 because i did 5^2 x 5^3 x5^0.5 rather that 5^1 x 5^3 x5^0.5. could i still get 1 mark
Possibly - I'm not sure.
11. (Original post by Rubberduckiller)
If one of my y co ordinate is wrog bu t my working from then on is fine will i get 2/4
On which question?
12. (Original post by Mr M)
On which question?
very last working out area of triangle
13. (Original post by Jords13)
What was question 5ii) i cant remember the answer
Find perpendicular bisector of (2,1) and (5,-3).
14. For 7b, I got to the -1/16 * 1/3 stage where you get -1/48, but I decided to divide by 1/3 (no idea why?), so got -3/16. How many marks do you reckon I lost? Thanks
15. (Original post by Rubberduckiller)
very last working out area of triangle
Yes.
16. (Original post by AstroNandos)
For 7b, I got to the -1/16 * 1/3 stage where you get -1/48, but I decided to divide by 1/3 (no idea why?), so got -3/16. How many marks do you reckon I lost? Thanks
Just lose one.
17. (Original post by Mr M)
Yes.
cheers thnx alot for clearing my doubts
18. For the last question, I worked out the 3 co-ords but failed to work out the area of the triangle. Do you think I would lose 2 or 3 of the 4 marks?
19. (Original post by duncant)
For the last question, I worked out the 3 co-ords but failed to work out the area of the triangle. Do you think I would lose 2 or 3 of the 4 marks?
Lose 2.
20. Thanks for the speedy reply. For Question 6 I got 3 solutions but failed to get the fourth, would I lose 1 or 2 marks? Also 2iii I said stretch but wrong scale factor, lose 1 or both marks? Again thanks!

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