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# OCR MEI FP1 (14th May 2015) Watch

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1. (Original post by YveT)
Nice subject choices!
I'm studying Biology, Chemistry, Maths and Further Maths, hoping for A*AA (at least) overall for Biochemistry at Oxford, but am also looking at Sheffield, Warwick and York
Nice I had an interview at Oxford, but unfortunately no offer. It was amazing.
2. (Original post by SH0405)
Nice I had an interview at Oxford, but unfortunately no offer. It was amazing.
That really sucks :/ I hope you get what you need for Warwick, it's an amazing university!!
3. Hi! In matrices what is the significance of a zero determinant?
4. (Original post by lucye7)
Hi! In matrices what is the significance of a zero determinant?
It means the matrix is singular (has no inverse)
5. Hi, Just a quick question:

When drawing complex numbers on an argand diagram, should you draw just a cross at the point or a line (with arrow) leading up to it from the origin??

The mark scheme usually shows just crosses but I believe the line w/arrow is the proper way?

Or does it really not matter?

Thanks.
6. (Original post by tambeshakunt)
Hi, Just a quick question:

When drawing complex numbers on an argand diagram, should you draw just a cross at the point or a line (with arrow) leading up to it from the origin??

The mark scheme usually shows just crosses but I believe the line w/arrow is the proper way?

Or does it really not matter?

Thanks.
I normally draw a line from the origin to the point (without an arrow). I'm sure they'll accept regardless of the presence of a line.
7. (Original post by tambeshakunt)
Hi, Just a quick question:

When drawing complex numbers on an argand diagram, should you draw just a cross at the point or a line (with arrow) leading up to it from the origin??

The mark scheme usually shows just crosses but I believe the line w/arrow is the proper way?

Or does it really not matter?

Thanks.
If they just ask for the point then a cross at those coordinates is correct. If they ask for the modulus of the complex number then you'd draw a line labelling it's length.
8. (Original post by Bruhh)
If they just ask for the point then a cross at those coordinates is correct. If they ask for the modulus of the complex number then you'd draw a line labelling it's length.
If they say modulus it will be written as mod | 2 - j | = 5 which would be a circle with radius 5 and centre 2 - j
9. (Original post by gmcoote)
If they say modulus it will be written as mod | 2 - j | = 5 which would be a circle with radius 5 and centre 2 - j
That would be |z-(2-j)| = 5 as the circle would represent the position where z could be, just |2-j| would be the distance from the origin to the point 2-j.
10. Ah ok thanks. Just that I have never seen a mark scheme where they have drawn a line with an arrow but I have learnt it that way

In the mark scheme after proof by induction it gives the answer as (k +1)((k +1)+1)((k +1)+ 2)(3(k +1)+1)

what if i write (k+1)(k+2)(k+3)(3k+4)

will that still get me all the marks
12. (Original post by simon1207)

In the mark scheme after proof by induction it gives the answer as (k +1)((k +1)+1)((k +1)+ 2)(3(k +1)+1)

what if i write (k+1)(k+2)(k+3)(3k+4)

will that still get me all the marks
Lol whats with the weird font? But yeah it should do as it's still technically correct. But by splitting it into (k+1) just shows you understand more what you've just done. but you should still get full marks.
13. (Original post by Bruhh)
Lol whats with the weird font? But yeah it should do as it's still technically correct. But by splitting it into (k+1) just shows you understand more what you've just done. but you should still get full marks.
Thanks
14. Could someone please explain how moduluses such as I z-4 I = 3 work? Is it just centre 4,0 with radius 3? Is there a rule i can follow to find the exact centre of the circle?
15. (Original post by Darcy1)
Could someone please explain how moduluses such as I z-4 I = 3 work? Is it just centre 4,0 with radius 3? Is there a rule i can follow to find the exact centre of the circle?
Yes you're right.

in general:

|z-(a+bj)|=r

where the centre is (a,b) and radius is r.
16. I'm taking this tomorrow as well! The only bit I'm worried I'll muck up is if they ask us to find where where two loci intersect on an argand diagram (so far so good), but then ask us to find the arg of the intersection :/ it's only come up in two past papers so I've got my fingers crossed haha!

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17. How did everyone find it then ?
18. (Original post by simon1207)
How did everyone find it then ?
Alright ish I think! Question 8 confused me a bit though :/

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19. It was a nice paper but the question on finding k was confusing for .me
20. What did you all put for the (8 part iii)transformation matrix ( back to triangle ABC) and the area of a"b"c"( 8 part4)?

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