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# Edexcel A2 C4 Mathematics June 2015 - Official Thread watch

1. (Original post by ASDuh97)
^Second this
Thirded
2. (Original post by veniceswan)
Are there any rules for presenting vectors? My teacher told me I have to write it as i+j+k form but can I just write is as column vector?
I always use column format. I've never seen an issue with it and never noticed the mark scheme saying one was preferable.
3. What are the hardest papers? I only have time for one or two.
4. Can someone please help me with Q 4b) June 2013 Replacement, I don't understand how they got 0.1 for x. Here's the paper and mark scheme...

https://a086a5a2f39bda93734c56a63fab...%20Edexcel.pdf

https://a086a5a2f39bda93734c56a63fab...%20Edexcel.pdf

5. (Original post by veniceswan)
Are there any rules for presenting vectors? My teacher told me I have to write it as i+j+k form but can I just write is as column vector?
Using column vector is accepted. Don't worry
6. (Original post by veniceswan)
Are there any rules for presenting vectors? My teacher told me I have to write it as i+j+k form but can I just write is as column vector?
I'd say always write in column form because it makes them so much easier to work with
7. Hoping for nasty DE Questions similar to that of Jan 2008 - 67/75 for full UMS and the last Q isn't really that bad.
8. The line l1 passes through the points A and B with position vectors (−3i + 3j + 2k)and (7i − j + 12k) respectively, relative to a fixed origin.

(the answer is r = (−3i + 3j + 2k) + λ(5i − 2j + 5k)) How do i do this?
9. (Original post by Hazza_)
What are the hardest papers? I only have time for one or two.
June 2013 R and the both of last years imo...

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10. (Original post by Gilo98)
Hoping for nasty DE Questions similar to that of Jan 2008 - 67/75 for full UMS and the last Q isn't really that bad.
Are you talking about Q8 in that paper? I might give it a go
11. (Original post by Hazza_)
What are the hardest papers? I only have time for one or two.
May wanna try gold 4 on physicsandmathstutor.com
12. (Original post by anonwinner)
Are you talking about Q8 in that paper? I might give it a go
Yep. just stick with it and be methodical - then it really isn't that bad
Need to get about half marks and I've not done much revision so which topics should I focus on?

Good luck by the way
14. (Original post by ooftar)
June 2013 R and the both of last years imo...

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(Original post by MickeyL0912)
May wanna try gold 4 on physicsandmathstutor.com
Thanks
15. (Original post by imedico10)
The line l1 passes through the points A and B with position vectors (−3i + 3j + 2k)and (7i − j + 12k) respectively, relative to a fixed origin.

(the answer is r = (−3i + 3j + 2k) + λ(5i − 2j + 5k)) How do i do this?
get the directed vector AB by subtracting B from A
AB=(10i -4j +10k) you can divide by 2 so the directed vector AB equals (5i-2j+5k)
r= any point on the line + directed vector*parameter ( λ)
therefore,
r = (−3i + 3j + 2k) + λ(5i − 2j + 5k)
16. (Original post by imedico10)
The line l1 passes through the points A and B with position vectors (−3i + 3j + 2k)and (7i − j + 12k) respectively, relative to a fixed origin.

(the answer is r = (−3i + 3j + 2k) + λ(5i − 2j + 5k)) How do i do this?
If you have two points a and b, you can write the equation as r = a + lambda(b-a), where lambda is the parameter. This kind of makes sense, because if you have lambda = 0 then you have the point a, and if you have lambda = 1 then you have a+b-a which is b, so the points a and b lie on this line, and you can find other points by changing lambda.
17. What are some hard integration questions? Which past papers have the hardest ones?
18. what are the formulas of like area and stuff should we know for connected rates type of questions? just want to make sure i'm fresh on my mind
19. some past papers if your lucky they gave it

On the safe side, I would say volume and surface area of cones and cylinder (and if you don't know cube/cuboid/prisms)

what are the formulas of like area and stuff should we know for connected rates type of questions? just want to make sure i'm fresh on my mind
20. For vectors, when do we use the position vector and when do we use the direction vector?
I'm confused as some questions get the scalar product by multiplying the direction vector of the line and the position vector of a point on the line...

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