Turn on thread page Beta

A tough inequality question! watch

    • Thread Starter

    find x which allows this inequality to hold:

    So I thought since, we don't know if x is negative or positive create 2 cases. Case 1) where x is negative and therefore x+2x^2-x^3<2, and solve
    or case 2) where x is positive and therefore x+2x^2-x^3>2

    Then working out the solutions to each and finding which set of x values satisfy the equation?

    If you can't help me with the actual equation, please let me know if my idea seems sensible or if it is flawed. Thanks!
    • Study Helper

    Study Helper
    (Original post by Student10011)
    Your thinking in fine.

    The cubic has easy roots.
Submit reply
Turn on thread page Beta
Updated: October 7, 2013

University open days

  • Manchester Metropolitan University
    Postgraduate Open Day Postgraduate
    Wed, 14 Nov '18
  • University of Chester
    Chester campuses Undergraduate
    Wed, 14 Nov '18
  • Anglia Ruskin University
    Ambitious, driven, developing your career & employability? Aspiring in your field, up-skilling after a career break? Then our Postgrad Open Evening is for you. Postgraduate
    Wed, 14 Nov '18
Should Banksy be put in prison?
Useful resources

Make your revision easier


Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here


How to use LaTex

Writing equations the easy way


Best calculators for A level Maths

Tips on which model to get

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

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

Write a reply...
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.