Edexcel C3,C4 June 2013 Thread

Original post by masryboy94

well i'll write up the whole question since you will probably need it:

12) Referred to a fixed origin O, the points A,B and C have position vectors (9,-2,1), (6,2,6) and (3,p,q) respectively, where p and q are constants.

a) find, in vector form, an equation of the line L which passes through A and B. (answer - r = (9,-2,1) + t(-3,4,5).

b) Find the value of p and the value of q. (answer - p=6, q=11).

c) Calculate, in degrees, the acute angle between OC and AB. (answer - 39.8 degrees).

d) The point D lies on AB and is such that OD is perpendicular to AB. Find the position vector of D. ??????????!!!!!!!! :confused:

Which part of it are you stuck with?

Oh sorry I just woke up didn't read it well. so part d right? Okay, let me just do it quickly and I'll attach the solution

(edited 11 years ago)

Reply 502

Original post by nukethemaly

Which part of it are you stuck with?

part d, not sure how to get the position vector :frown:

Reply 503

Original post by nukethemaly

Oh sorry I just woke up didn't read it well. so part d right? Okay, let me just do it quickly and I'll attach the solution

thank you !

Reply 504

sounique

Original post by Better

Good idea mate! Will do all of the difficult topics for c3/c4 by friday then start going through all the solomon press stuff as well.

Hit me on my wall wanna see how it goes! We can keep tabs on each other

Ooh! I'd like to scrape in and say I desperately need an A* for my offer at Bham and am most hopeful in getting it in Maths! Do you mind if I asked you questions on the Solomon/real papers?

Good luck to us all! :smile:

Reply 505

Original post by masryboy94

thank you !

Here you are!

photo (23).jpg525.4KB

Reply 506

Original post by nukethemaly

Here you are!

thank you so much !!!! :eek:

REPPED !

Reply 507

Original post by masryboy94

thank you so much !!!! :eek:

REPPED !

I hope its easy to follow through. These questions are usually for 6 marks in the exam paper, so worth learning the format :smile:

Reply 508

Original post by nukethemaly

I hope its easy to follow through. These questions are usually for 6 marks in the exam paper, so worth learning the format :smile:

don't think you could've explained and laid it out any better tbh lol :wink:

so thank you very much !

Reply 509

Better

OP

Original post by sounique

Ooh! I'd like to scrape in and say I desperately need an A* for my offer at Bham and am most hopeful in getting it in Maths! Do you mind if I asked you questions on the Solomon/real papers?

Good luck to us all! :smile:

Yeah you can hit me up on my wall too mate, we can see how far we are both going on number of Papers each week - if you want.

But people here are really helpful too, just throw up a comment of what you don't get and most people will help explain it

Reply 510

Better

OP

Original post by nukethemaly

I hope its easy to follow through. These questions are usually for 6 marks in the exam paper, so worth learning the format :smile:

Nukethemaly is awesome!!

Reply 511

Original post by Better

Nukethemaly is awesome!!

hell yeaa buddy

Reply 512

sounique

Original post by Better

Yeah you can hit me up on my wall too mate, we can see how far we are both going on number of Papers each week - if you want.

But people here are really helpful too, just throw up a comment of what you don't get and most people will help explain it

Sweet! Cheers, how many papers are you averaging per week?

(edited 11 years ago)

Reply 513

laurawoods

Original post by brittanna

I applied to do maths. I've firmed Warwick and insured KCL. To get into Warwick, I need A*A*A + 2 in STEP/ Distinction in AEA :s-smilie:

. To get into KCL in need AAA. What did you apply for and what do need to meet your offers?

Hello , pls can I ask u a quick question regarding c4 ? Do we have to know the trapezium rule for c4 ? I saw it in a couple of the Elmwood Papers, but was wondering if we had to actually know it for the real exam? Thanks for all ur help! :smile:

Reply 514

Lilmzbest

Original post by sechdent8

hey guys i got a question about C4. I was doing EX 6E in the new edexcel book page 100. I've been told this is integration by recognition however a couple of people have told me to learn integration by substitution first and then use this exercise as practise? Is this is a good idea? The examples before the exercise seem to use a weird method... Please help
Thanks

I'm abroad so my C4 book is halfway around the world...but I think I can guess which exercise you mean :colondollar:

if its the one that I think it is then yeah its all about looking at what can be differentiated to give the given equation and then trying it out and multiplying by a constant to give the correct answer. I think the whole point is to show that sometimes this is a quicker method, and also that you can always check your answer by differentiating it and seeing if it works :smile:

Tbh you can use this as substitution practise but i'd use it as practice for 'integration by recognition' so that you get practice for it :smile:

Lemme know if you need any help with this exercise :smile:

Reply 515

Better

OP

Original post by sounique

Sweet! Cheers, how many papers are you averaging per week?

By the end of this week 15th April. I want 4 D1 done, C4 3, C3 2 (Solomon Press for D1)

Then Will aim to do 2 a week until the exam under timed conditions. Focusing on my weaknesses ideally on the same day.

Reply 516

tiny hobbit

15

Original post by nukethemaly

Here you are!

But either give the position vector as a column vector with no i, j or k, or in the form ai+bj+ck

Your mixed coordinate/vector is likely to lose the final mark.

Reply 517

nm786

2

Original post by laurawoods

Hello , pls can I ask u a quick question regarding c4 ? Do we have to know the trapezium rule for c4 ? I saw it in a couple of the Elmwood Papers, but was wondering if we had to actually know it for the real exam? Thanks for all ur help! :smile:

If you're doing Edexcel maths then yes you have to learn the trapezium rule, everything you need to know is listed in the specification: http://www.edexcel.com/migrationdocuments/GCE%20New%20GCE/UA024850%20GCE%20in%20Mathematics%20issue%202%20180510.pdf

Reply 518

nm786

2

Original post by tiny hobbit

But either give the position vector as a column vector with no i, j or k, or in the form ai+bj+ck

Your mixed coordinate/vector is likely to lose the final mark.

I still don't understand vectors :frown:

have you got any notes you could please share?

Reply 519