x Turn on thread page Beta
 You are Here: Home >< Maths

# Edexcel A2 C4 Mathematics June 2015 - Official Thread watch

1. (Original post by blingaling)
How do you estimate an approximate value in binomial expansion? For instance from the june 2013 reserve paper it asks estimate the approximate value of (7100)^1/3 using the binomial expansion of (8-9x)^1/3 ? I know you have to always sub in x=0.1 but how do you get this value?
If x=0.1 the 8-9x = 7.1
7100 is 7.1 x 1000
so eqn becomes 7.1^1/3 x 1000^ 1/3 (and 1000^1/3 = 10)
and take it from there
2. Hitler reacts to C4 June 2015....
3. (Original post by SkilledNChilled)
Hitler reacts to C4 June 2015....
4. (Original post by Freddy-Francis)
Do you even know of this meme?
5. (Original post by Freddy-Francis)
He's still reacting to a lot of **** man, don't count him out just yet.
6. (Original post by SkilledNChilled)
Do you even know of this meme?
dude there is one for every exam now
7. Am i right in saying if i get completely stuck on part (a) of a question, and the next part of the question requires the answer for part (a) for you to continue, that i should just make an answer up and then i'd get some error carried forward marks?
8. I always find connecting rate of change and vectors difficult any tips?
10. (Original post by Kill3er)
Am i right in saying if i get completely stuck on part (a) of a question, and the next part of the question requires the answer for part (a) for you to continue, that i should just make an answer up and then i'd get some error carried forward marks?
To be honest, if it's a question which is hard enough to get stuck on, they make that part a 'show that', or occasionally give you a value to use in the next part if you are stuck. If somehow your situation came up, and you can find no alternative, then that'd probably be the best way to go, but they normally cover that.
11. (Original post by blingaling)
How do you estimate an approximate value in binomial expansion? For instance from the june 2013 reserve paper it asks estimate the approximate value of (7100)^1/3 using the binomial expansion of (8-9x)^1/3 ? I know you have to always sub in x=0.1 but how do you get this value?
(7.1)^1/3*(1000)^1/3
(7.1)^1/3*10
12. (Original post by Star Light)
To be honest, if it's a question which is hard enough to get stuck on, they make that part a 'show that', or occasionally give you a value to use in the next part if you are stuck. If somehow your situation came up, and you can find no alternative, then that'd probably be the best way to go, but they normally cover that.
That's true, thanks
13. (Original post by Kill3er)
That's true, thanks
The only question type that I can think of where this could happen is in numerical methods... find x1, x2, and x3, and use that answer to find the solution to 3 decimal places or something. But since numerical methods is the easiest topic on the paper, they don't provide backups for this
14. Good luck everyone! hope the exam paper isn't as hard as c3
15. Thank you for your answers, but I meant how do you get the x=0.1? from all that to then sub it into the binomial expansion?
16. (Original post by tinkerbell55)
I always find connecting rate of change and vectors difficult any tips?
They can be hard, it's always a good idea to write out what you need, for example if you need to find dx/dt, that equals dx/dv * dv/dt, of course the v could be anything, but you'll always be given something to connect the v and x and the v and t, I know this isn't the best patch up but just try to always write out what you need...

With the vectors, why not watch some of Examsolutions' videos on them?

Good luck to everyone today
17. Exam is in a few hours.
People already want Hitler react video.
I'll go get my TARDIS
18. anyone else feel like they will never be prepared for this exam?
19. (Original post by tinkerbell55)
I always find connecting rate of change and vectors difficult any tips?
For vectors, always draw what you are given. Your eyes might take something that your brain can't and always try to make triangles if you are previously asked to find an angle.
20. (Original post by sophia_e)
anyone else feel like they will never be prepared for this exam?
More like I haven't had the time to prepare for this exam

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: April 20, 2016
Today on TSR

### Loughborough better than Cambridge

Loughborough at number 1

### Can i date a girl with no boobs?

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