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# [Official Thread] OCR MEI AS Mathematics 2016 (C1, C2 & S1)

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1. (Original post by bethygirl)
Hi guys. For the question which you had to firstly estimate the roots of the graph and then show that the two equations made all one equation which was a cubic and then find the exact roots. You did get 3 different roots right? I've seen on the post above that someone got x = 1 and then a weird surd however I got X = - 1 then did the polynomial division thing then got the other 2 roots as a surd using quadratic formula. Was is positive or negative 1 because looking at the image of the graph it definitely showed as X = -1 as it was all on the left hand side of the Y axis ? Thanks for any help anyone can give I am STRESSING
I got x=-1 as a root too, as (x+1) is the factor, i also got two other surds :s
2. (Original post by JoshP97)
For the proof question (show that ABC is 90 degrees) what did people do? I calculated the lengths of the lines using the coordinates then did used pythag to find the length, got the same answer and since pythag on works on right angled triangles I said ABC had to be a right angle. Did other people do the same?
This is a fine method. The more typical method is finding the gradients however both methods will be accepted in the mark scheme, as it has for previous years.
3. Question 11 part 3 only asked for roots of where the graphs met, didn't ask for coordinates right?? I only put x values
4. Mark scheme anyone?
5. (Original post by ionic285)
For the remainder theorem question did anyone get b=-2 c=7
Yupppp
6. Here's an Unofficial Mark Scheme. Anyone want to create a thread with it in?
7. (Original post by Realforce)

Can you all please help with question 10 and 11. The question along with the answer is all that is needed. Thank you.
The mark scheme needs tidying up its a bit of a mess
8. For the question about proving the angle ABC was 90 degrees. So I found the 2 gradients which came out as 2 and -1/2 I believe. Many people are saying they then went on to say how 2 times -1/2 is -1 showing its perpendicular. I didn't do this, I wrote '-1/2 is the negative recipricol of 2 therefore showing it is perpendicular hence 90 degrees' is saying negative recipricol going to get me that final mark or did I need to specifically say they times to make -1 ?
9. what does everybody predict they've got after looking at the unofficial mark scheme Ect ? I think 65/72 unfortunately
10. Q11 ii) Found the x-coordinates correctly but forgot about y-coordinates. Will I miss 1 or 2 marks? (Or more... )
11. Can anyone remember how many marks these questions were worth:

1) question 4, the rearranging formula one
2) working out the intercepts of the lines in section A
3) tangent to circle
4) last part of last question

These are the things I think I got wrong - I rearranged the wrong way for question 4 so probably won't get any marks. I got the X coordinate right for the intersections but I forgot to work out the y coordinate - how many marks will I lose for that? For some reason my tangent is just completely wrong so I don't know if I got any marks for that. In the last part of the last question I got the X coordinates right but I didn't simplify the y coordinates fully ie. I left them as 3+-root21/2 + 3 - how many marks do you think I'll lose for that?

If those are the only things I've got wrong in the paper (I *think* they might be), do you think I can still get an A in the paper?
12. (Original post by bethygirl)
what does everybody predict they've got after looking at the unofficial mark scheme Ect ? I think 65/72 unfortunately
Why's that unfortunate?!
13. (Original post by erinls2)
Why's that unfortunate?!
Because I'm really struggling with core 3 and 4, I was hoping for a really high mark to bring my grade up as I need a A/B for my uni conditions
14. I swear there was a question asking to find the intersection coordinates of the curve and the axes ? Or did I read this wrong ?
15. (Original post by bethygirl)
For the question about proving the angle ABC was 90 degrees. So I found the 2 gradients which came out as 2 and -1/2 I believe. Many people are saying they then went on to say how 2 times -1/2 is -1 showing its perpendicular. I didn't do this, I wrote '-1/2 is the negative recipricol of 2 therefore showing it is perpendicular hence 90 degrees' is saying negative recipricol going to get me that final mark or did I need to specifically say they times to make -1 ?
I think it its required to show M1 x M2 = -1. However, if thats the case you will lose only one mark. I will check the marking scheme
16. (Original post by bethygirl)
I swear there was a question asking to find the intersection coordinates of the curve and the axes ? Or did I read this wrong ?
Yes there was one.
17. The only questions I seem to have messed were the last two parts of the last question. I got k < -50/8 when it should have been k <-60/8 so I guess A1/2 was wrong, so 3 marks gained for method? And for the one before that I found out the root to be 6+/- root 84 / 4, but then I stupidly divided the whole thing by 4 to get 1.5 +/- root 4, and I didn't even get the y co-ordinates, how many marks do you guys think I will have lost for that question?
18. Q1 ii: 9^3/2

I put 27 - will i lose marks for not putting +-?
19. Will I lose all 4 of the marks for rearranging question 4 so that c was the subject- I can't believe I did it wrong!
Thank you
20. (Original post by tizzaclaire98)
Q1 ii: 9^3/2

I put 27 - will i lose marks for not putting +-?
I only put 27. I'm looking on past papers and the ones I've looked at they've only put the positive answer in the mark scheme ?

for example :

Jan 13 - (81)^3/4 the answer is 27 only
Jan 12- (9)^-1/2 the answer is 1/3 only but has at the side 'allow + or -' therefore I presume just having 27 is completely correct

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