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# OCR FP1 (Non-MEI) 14th May 2015 watch

1. Yep. -2-root3 + i

(Original post by bred123)
Yeh i thought there was at first, because there was 2 positions of the plus and minus signs,
but when you did all 4, 2 of them just converted into the opposite ones so it just came out with 2 of the same answers.

This is what i had for the point of intersection. Did anyone get the same?
edit: I knew I was right. Definitely only 2 solutions.
I didn't complete the square I used a different method.
Took 4 from both sides then took 5+12i to the other side
then factorised the left (x-2)(x-2) = 5+12i
so x was the square root of 5+12i + 2 (2 solutions)
2. Okay awesome thanks pal,
that was the question i was wary about. I didnt originally put -2 until the last minute, i took it from the circles centre haha,

Hope you and everyone has done great, bring on core 2 haha
3. (Original post by bred123)
Okay awesome thanks pal,
that was the question i was wary about. I didnt originally put -2 until the last minute, i took it from the circles centre haha,

Hope you and everyone has done great, bring on core 2 haha
Hope you've done well too. Bring on core 2 and D2 on the same day.. ^_^

edit: remembered the equation
4. hahaha I actually managed to get the hard answers like 29, but for the loci bit I got the right point but I gave it as coordinates 😂😂😂 anyway did anybody get 1.25 for the summations one?
5. (Original post by Yeezus)
hahaha I actually managed to get the hard answers like 29, but for the loci bit I got the right point but I gave it as coordinates 😂😂😂 anyway did anybody get 1.25 for the summations one?
Yeah we all did - that was a nice question - I especially liked how there were three terms and the whole thing quite literally lived up to the expectation of it being a "telescope" method
6. (Original post by Wawasan)
Yeah we all did - that was a nice question - I especially liked how there were three terms and the whole thing quite literally lived up to the expectation of it being a "telescope" method
yup 1.25 XD
7. Can someone remember how many marks were for each question? We have a user generated mark scheme, but if anyone can remember, that would be really helpful!
8. Any grade boundary predictions?

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9. (Original post by GM16)
Any grade boundary predictions?

I have a feeling the A boundary might be 60-63 ish. Just guessing though!
10. (Original post by Jamesb17_)
I have a feeling the A boundary might be 60-63 ish. Just guessing though!
I agree, I'm thinking about 60 for an A

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11. Anyone know if arsey has bought out his solutions yet?
12. I got -(root3) + i
13. (Original post by JPerrin98)
I got -(root3) + i
your circle was also 2 negative x units from the origin!
14. (Original post by Parallex)
your circle was also 2 negative x units from the origin!
Very true
15. I did this too! Talk about throwing away marks! 😔
16. couldn't do the last one, couldn't do the quadratic one, messed up the matrices, got the wrong loci intercept, I'm gonna enjoy this U
17. (Original post by Parallex)
29

you got which was 64
then took away which was 32

then refer to the original equation of x

you couldn't use your equation in u to find aby because you had no way of deciding whether root 9 was -3 or +3, so refer to the original equation

-d/a = -3/1 = -3

32-3=29
ah I ended up with -32 -3 = -35, shouldn't lose many marks for a sign error? Depends if my method was sound I guess
18. I did it right for 10 ii but had a carry on error from 10 i, and I didn't put much working. Do you need to show working if you get the right answer? Would I get all the marks for working?
19. (Original post by kamiokirby)
I did it right for 10 ii but had a carry on error from 10 i, and I didn't put much working. Do you need to show working if you get the right answer? Would I get all the marks for working?
E.c.f means you will get all the marks assuming you made no mistakes in the part of the question where you were going on a follow on error.

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