Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    10
    ReputationRep:
    "The roots of the equation ax^3+bx^2+cx+d=0 are α= 3/2 , β= 1/2 and γ=1
    Find the integer values of a b c and d"

    Some help would be nice. I have all the formulas and have used them to try and come up with an answer however, when i checked my answer, it said i was wrong but the text book doesn't give a clear understanding of how to work it out and i can't find any videos showing a question like this.
    • Community Assistant
    • Welcome Squad
    Offline

    20
    ReputationRep:
    (Original post by TJ149)
    "The roots of the equation ax^3+bx^2+cx+d=0 are α= 3/2 , β= 1/2 and γ=1
    Find the integer values of a b c and d"

    Some help would be nice. I have all the formulas and have used them to try and come up with an answer however, when i checked my answer, it said i was wrong but the text book doesn't give a clear understanding of how to work it out and i can't find any videos showing a question like this.
    Just expand (x-\frac{3}{2})(x-\frac{1}{2})(x-1)=0 and multiply through whatever to get the coefficients to be integers - then just compare the two cubics for your values.
    • Thread Starter
    Offline

    10
    ReputationRep:
    (Original post by RDKGames)
    Just expand (x-\frac{3}{2})(x-\frac{1}{2})(x-1)=0 and multiply through whatever to get the coefficients to be integers - then just compare the two cubics for your values.
    Thank you for the help I can see what I was missing
 
 
 
  • 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.

  • Poll
    Will you be richer or poorer than your parents?
    Useful resources

    Make your revision easier

    Maths

    Maths Forum posting guidelines

    Not sure where to post? Read the updated guidelines here

    Equations

    How to use LaTex

    Writing equations the easy way

    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
  • 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.

  • 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

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