You are Here: Home >< Maths

# Stuck on c2 question watch

1. 11b) mixed exercise 5e , binomial expansion.
By making suitable substitutions for x in your answer to part a , show that (2+sqrt3)^6 -(2-sqrt3)^6 can be simplified to the form ksqrt3
2. (Original post by Garyglitter)
11b) mixed exercise 5e , binomial expansion.
By making suitable substitutions for x in your answer to part a , show that (2+sqrt3)^6 -(2-sqrt3)^6 can be simplified to the form ksqrt3
I haven't done this in years so I can't remember the binomial expansion formulae, but have you tried using "let x = sqrt3"? Rewrite the question to get (2+x)^6 - (2-x)^6, expand, gather up terms and then switch the x for sqrt 3 again.

Hopefully that'll do it!
3. Firstly unamusing choice of name.

Secondly there is more than one textbook for Core 2 and more than one Awarding Body.

Thirdly you could use the difference of two squares. or use the binomial theorem.
4. (Original post by Garyglitter)
11b) mixed exercise 5e , binomial expansion.
By making suitable substitutions for x in your answer to part a , show that (2+sqrt3)^6 -(2-sqrt3)^6 can be simplified to the form ksqrt3
Clearly you need to use part a

It would help if you gave us part a
5. (Original post by TenOfThem)
Clearly you need to use part a It would help if you gave us part a
Dear Sir I may give you part a in return for help...It might get a tad bit messy but here it is:64+192x+240x^2+160x^3+60x^4+6 x^5+x^6http://www.thestudentroom.co.uk/images/smilies/eek.png
6. (Original post by Kenchmeister)
Dear Sir I may give you part a in return for help...It might get a tad bit messy but here it is:64+192x+240x^2+160x^3+60x^4+6 x^5+x^6http://www.thestudentroom.co.uk/images/smilies/eek.png

I doubt that is the question

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: February 14, 2013
Today on TSR

### Congratulations to Harry and Meghan!

But did you bother to watch?

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams