You are Here: Home >< Maths

# Edexcel FP1 Thread - 20th May, 2016 watch

1. (Original post by iMacJack)
Zacken please can you explain the f(k) = 5m or whatever method please very briefly?

Cheers...
I don't think I should, it'll just confuse you and it's the night before... stick to the normal method, it works everytime.
2. (Original post by Hot&SpicyChicken)
When multiplying a matrix by an inverse of another matrix, how do you know what side to put the inverse on, if both matrices are 2x2, this really messes me up??

If we have AB = C and we have C and A and need to find B we need to isolate it

So you put A^-1 to the far left -----> A^-1AB = A^-1C

This gives B = A^-1C

The Identity Matrix has to be A^-1A or AA^-1 (i.e. side by side)

So if you were to do this ----> ABA^-1, the RIGHT would be CA^-1,
so we CANNOT make AA^-1 into I as they are not side by side.

So bear in mind that ABA^-1 =/= A^-1AB

Sorry if it's badly explained, hope it helps
3. (Original post by connorbarr)
If this helps

Oh ok that is very helpful thank you very much!
4. https://7cba9babeb0db0ff9468853e0b2d...%20Edexcel.pdf

Can someone please check, surely question 8)(c) is wrong, and it should be the normal?
5. (Original post by Zacken)
I don't think I should, it'll just confuse you and it's the night before... stick to the normal method, it works everytime.
But I was unable to get the one in the IAL 2015 paper using it.
6. (Original post by connorbarr)
This one? This is from my notebook when i did the paper
Thank you very much! I understand it now.

Also can I commend you on your incredibly neat notes
7. (Original post by iMacJack)
But I was unable to get the one in the IAL 2015 paper using it.
It's perfectly do-able using it.
8. Going to sleep now, good luck everyone.
9. Well that is me off so good luck to everyone Hope all goes well for you in this exam and all the others

signing out.
10. (Original post by alfmeister)
Going to sleep now, good luck everyone.
(Original post by Music With Rocks)
Well that is me off so good luck to everyone Hope all goes well for you in this exam and all the others

signing out.
Good luck.
11. (Original post by iBall)
Is this method fine for proof divisibility? (didn't complete the q in its entirety i know..)
Yup I think it should be fine i got the exact same answer but instead of 20A i got 4f(k) which is exactly the same thing
12. (Original post by Zacken)
It's perfectly do-able using it.
yeah i know haha I just wasn't able to personally
13. (Original post by iMacJack)
yeah i know haha I just wasn't able to personally
It'll be fine tomorrow, just get some sleep.
14. (Original post by Zacken)
Good luck.
https://7cba9babeb0db0ff9468853e0b2d...% 20Edexcel.pdf

Can you please check, surely question 8)(c) is wrong, and it should be the normal? not the tangent?
15. (Original post by Hot&SpicyChicken)
https://7cba9babeb0db0ff9468853e0b2d...% 20Edexcel.pdf

Can you please check, surely question 8)(c) is wrong, and it should be the normal? not the tangent?
Seems fine to me, what's the problem?
16. (Original post by Zacken)
Seems fine to me, what's the problem?
For wuestion 8) (c) it is impossible for the tangent to meet the curve again, bu the normal does, so i think the question is wrong?
17. (Original post by Hot&SpicyChicken)
For wuestion 8) (c) it is impossible for the tangent to meet the curve again, bu the normal does, so i think the question is wrong?
https://7cba9babeb0db0ff9468853e0b2d...%20Edexcel.pdf

Even the mark scheme uses the normal? Am i correct or just liost?
18. Hey could someone please link/ send me some hard proofs by induction for each of the proofs mentioned on the spec
19. (Original post by Hot&SpicyChicken)
https://7cba9babeb0db0ff9468853e0b2d...%20Edexcel.pdf

Even the mark scheme uses the normal? Am i correct or just liost?
Haven't done the question but it is possible for the tangent to meet and xy graph again i think
20. (Original post by Hot&SpicyChicken)
https://7cba9babeb0db0ff9468853e0b2d...%20Edexcel.pdf

Even the mark scheme uses the normal? Am i correct or just liost?
Don't worry that's a typo, I got stuck on it too. The tangent doesn't ever meet the curve again, which actually checks out as if you equate the tangent at that point to the curve, you get (x-6)^2 = 0

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: August 18, 2016
Today on TSR

### He lied about his age

Thought he was 19... really he's 14

### University open days

Wed, 25 Jul '18
2. University of Buckingham
Wed, 25 Jul '18
3. Bournemouth University
Wed, 1 Aug '18
Poll
Useful resources

Can you help? Study help unanswered threadsStudy Help rules and posting guidelinesLaTex guide for writing equations on TSR

## Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE