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# The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread

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1. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by Jorgeyy)
Did you buy an account? Is it any good?

I'm considering it... even if I only use it for FP3 (of which I am terrible at right now xD)
Oh, you have subscribed for it? Well, its seems useful for me as the tutor hasn't taught me the 2 last chapter of FP3 So, its a bit slow but I can write notes while he is explaining
2. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by koko298)
Oh, you have subscribed for it? Well, its seems useful for me as the tutor hasn't taught me the 2 last chapter of FP3 So, its a bit slow but I can write notes while he is explaining
Yeah, I went through the M2 playlist.

It's good, if a bit slow per video, and lacking in overall content.

It provides a decent basis for you to begin past papers and then really understand the questions though.

I will start the FP3 playlist Thursday
3. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread

Hi guys, I'm having trouble with 12 b). I'm not sure why when implementing the inequality it is |w + i| ≤ |w - i| . Any explanations would be much appreciated.
4. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by zxh800)

Hi guys, I'm having trouble with 12 b). I'm not sure why when implementing the inequality it is |w + i| ≤ |w - i| . Any explanations would be much appreciated.
From part a we know:

If

Therefore:

Does that help?
5. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by Dreamweaver)
From part a we know:

If

Therefore:

Does that help?
I'm afraid I don't get it. I'm confused as to how to substitute

into

I can't get my head round why the inequality is not the other way around.
6. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by zxh800)
I'm afraid I don't get it. I'm confused as to how to substitute

into

I can't get my head round why the inequality is not the other way around.
You are correct, the inequality is the other way round. If this is from the FP2 textbook, some of the answers have the shading in the wrong place. I haven't got the book here so I can't check it.

Always substitute from the equation into the inequality.
7. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by tiny hobbit)
You are correct, the inequality is the other way round. If this is from the FP2 textbook, some of the answers have the shading in the wrong place. I haven't got the book here so I can't check it.

Always substitute from the equation into the inequality.
Right thanks, I thought something was fishy.
8. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by zxh800)
I'm afraid I don't get it. I'm confused as to how to substitute

into

I can't get my head round why the inequality is not the other way around.
You are correct, i made a mistake. Is this a question from the textbook?
9. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by Dreamweaver)
You are correct, i made a mistake. Is this a question from the textbook?
Yes. Excercise 3H Q. 12.
10. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
how do you do part a) and c) of that ?
11. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by Omar1994)
how do you do part a) and c) of that ?
Post your solution to b), but make sure you spoiler it, since someone else might want to have a go and you'll ruin it for them. Next time you want to ask me a question related to those 3 problems, quote me. I'll post all 3 solutions when everyone's had a go at the questions. Waiting on Rahul.S and anyone else who wants to have a go.
12. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
Hey again guys, how do you guys approach questions about the intersection of two planes as shown below:

EDIT:

Hmmm, I seem to get different lines depending on which variable I eliminate. Which answer is right then?

EDIT2: hmm, nevermind I think I've got it. It doesn't matter which variable you eliminate does it? You may get different lines with different "a" position vectors but the direction vector will always have the same ratio of i j and k.
Last edited by zxh800; 30-05-2012 at 18:55.
13. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
DOoes anyone know how to do 3b here: http://www.edexcel.com/migrationdocu...e_20100624.pdf

I could do it but cant deduce it from question a
Thank you
Last edited by elkana; 30-05-2012 at 20:04.
14. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by zxh800)
Hey again guys, how do you guys approach questions about the intersection of two planes as shown below:

EDIT:

Hmmm, I seem to get different lines depending on which variable I eliminate. Which answer is right then?

EDIT2: hmm, nevermind I think I've got it. It doesn't matter which variable you eliminate does it? You may get different lines with different "a" position vectors but the direction vector will always have the same ratio of i j and k.
Yeah, you're right.
15. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread

Part b) for the 2nd plane I get the distance from the origin as 2 instead of -2. What am I doing wrong?

I get the direction vector of the plane as 6i + 8j -24k which I dot the point 14i+2k+2k against and get 52.

52/28 to get the distance from the origin as 2.
16. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
anyone know how to do 3b here: http://www.edexcel.com/migrationdocu...e_20100624.pdf

I could do it but cant deduce it from question a, which is what they want you to do
Thank you
17. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
These are my last maths exams now! I best get back onto revising them.
18. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
Hi guys I'm having trouble with a vectors question.
It's question 10 part c, from mixed ex 5G in the fp3 edexcel green book. Thanks
19. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
Never mind I've got it now. Thanks anyway
20. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by Groat)
These are my last maths exams now! I best get back onto revising them.
I'm going to start by watching the vids on that livemaths thing, aha.

It's probably worth the £40 just to prevent your brain hurting from constant papers/review exercise questions.

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