Turn on thread page Beta

c3 help dividing polynomials (long division and remainder theorem) WILL REP! PLEASE! watch

    • Thread Starter
    Offline

    1
    ReputationRep:
    x^4 + 3x^2 - 4

    all divided by

    x^2 + 1


    i have to solve this question using 1) long division 2) factor theorem

    BUT i cant do either

    for long division i rewrote it as


    x^4 + 0x^3 + 3x^2 + 0x- 4

    all divided by

    x^2 +0x + 1

    but it all just goes wrong

    if someone could write it out/photo it i'd love them forever and rep immediately?

    as for remainder theorem, i havent a bloody clue. is it possible to explain to me or should i just stick to long division, or just keep practising or something? i'm already failing c3 and i only started a few days ago

    thanks
    jb
    • PS Helper
    Offline

    4
    ReputationRep:
    PS Helper
    (Original post by jumblebumble)
    x^4 + 3x^2 - 4

    all divided by

    x^2 + 1


    i have to solve this question using 1) long division 2) factor theorem

    BUT i cant do either

    for long division i rewrote it as


    x^4 + 0x^3 + 3x^2 + 0x- 4

    all divided by

    x^2 +0x + 1

    but it all just goes wrong

    if someone could write it out/photo it i'd love them forever and rep immediately?

    as for remainder theorem, i havent a bloody clue. is it possible to explain to me or should i just stick to long division, or just keep practising or something? i'm already failing c3 and i only started a few days ago

    thanks
    jb

    http://www.youtube.com/watch?v=vPr2Er1Usi4

    hard to know where you're going wrong. Maybe post a bit and saye exactly where you're stuck? Otherwise we're essentially teaching you form stratch which isn't what this forum is for.
    Offline

    14
    ReputationRep:
    (Original post by jumblebumble)
    x^4 + 3x^2 - 4

    all divided by

    x^2 + 1


    i have to solve this question using 1) long division 2) factor theorem

    BUT i cant do either

    for long division i rewrote it as


    x^4 + 0x^3 + 3x^2 + 0x- 4

    all divided by

    x^2 +0x + 1

    but it all just goes wrong

    if someone could write it out/photo it i'd love them forever and rep immediately?

    as for remainder theorem, i havent a bloody clue. is it possible to explain to me or should i just stick to long division, or just keep practising or something? i'm already failing c3 and i only started a few days ago

    thanks
    jb
    You have said " Solve " you don't solve a division sum. Perhaps the question was " Find the remainder when f(x) is divided by x^2 +1
    Offline

    3
    ReputationRep:
    You could try:

    let y = x^2

    and work from there ... note x^4 = (x^2)^2 = y^2
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: January 22, 2010
Poll
Cats or dogs?
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

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