Fp2 roots of equations help needed Watch

Elliesims
Badges: 0
Rep:
?
#1
Report Thread starter 5 years ago
#1
Need help with a question:
equation : x3 - 2x - 5 = 0
has roots alpha, beta , gamma.
find the cubic equation with roots alpha3 beta3, gamma3 where do I start with this question , I have found -d/a as 15 is this right?
Thank you
0
reply
BabyMaths
  • Study Helper
Badges: 0
Rep:
?
#2
Report 5 years ago
#2
(Original post by Elliesims)
Need help with a question:
equation : x3 - 2x - 5 = 0
has roots alpha, beta , gamma.
find the cubic equation with roots alpha3 beta3, gamma3 where do I start with this question , I have found -d/a as 15 is this right?
Thank you
How did you get that value?

I would use a substitution.

Substitute u^{1/3} for x and the question almost does itself.
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • SOAS University of London
    Postgraduate Open Day Postgraduate
    Wed, 29 May '19
  • University of Exeter
    Undergraduate Open Day - Penryn Campus Undergraduate
    Thu, 30 May '19
  • Cranfield University
    Cranfield Forensic MSc Programme Open Day Postgraduate
    Fri, 31 May '19

How did your AQA A-level Business Paper 1 go?

Loved the paper - Feeling positive (191)
22.66%
The paper was reasonable (389)
46.14%
Not feeling great about that exam... (156)
18.51%
It was TERRIBLE (107)
12.69%

Watched Threads

View All