You are Here: Home >< Maths

AQA FP2 help needed

Announcements Posted on
Would YOU be put off a uni with a high crime rate? First 50 to have their say get a £5 Amazon voucher! 27-10-2016
1. Having trouble with question 8 on the AQA FP2 January 2012 paper, specifically part c and d. If anyone would be willing to help I would be extremely grateful.

Thanks
2. (Original post by IMZL)
Having trouble with question 8 on the AQA FP2 January 2012 paper, specifically part c and d. If anyone would be willing to help I would be extremely grateful.

Thanks
What have you tried?
3. (Original post by joostan)
What have you tried?
I haven't gotten far at all really. Only thing I can see is pairing z+1/z and z^2+1/z^2, to get 2cos2π/5 and 2cos4π/5?
4. (Original post by joostan)
What have you tried?
I just got part c I think. Using part b to multiply out corresponding linear factors( i.e. (z-e^2πi/5)(z-e^-2πi/5)) noticing e^-2πi/5+e^2πi/5=2cos2π/5 and dividing by z^2?
5. For part (d) find w^2 and see how you can write z^2 + z^(-2) in terms of only w and w^2 this should let you get a quadratic in w.
6. (Original post by Zacken)
For part (d) find w^2 and see how you can write z^2 + z^(-2) in terms of only w and w^2 this should let you get a quadratic in w.
Oh yeah, got it, thanks!
7. (Original post by IMZL)
I just got part c I think. Using part b to multiply out corresponding linear factors( i.e. (z-e^2πi/5)(z-e^-2πi/5)) noticing e^-2πi/5+e^2πi/5=2cos2π/5 and dividing by z^2?
This is correct, by the way. :-)

Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: March 31, 2016
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:
Today on TSR

Find out here

Poll
Useful resources

Maths Forum posting guidelines

Not sure where to post? Read here first

How to use LaTex

Writing equations the easy way

Study habits of A* students

Top tips from students who have already aced their exams

Chat with other maths applicants