Turn on thread page Beta
    • Thread Starter
    Offline

    10
    ReputationRep:
    Hey can anyone help me on how to expand and factorise?
    Offline

    20
    ReputationRep:
    All you are doing is expanding an expression or equation. I have posted on your other thread on how to factorise. Once you learn factorising expression and equations, we can move on to expanding them because it will give you a better understanding of the topic.
    • Thread Starter
    Offline

    10
    ReputationRep:
    It’s not so much with a single question I think I need like a step by step instruction on how to factorise, with an example. I get it once and then I literally forget when we go over it or it comes in an exam question! I know it’s a pain but if you could help... thanks
    Offline

    4
    ReputationRep:
    (Original post by july13)
    It’s not so much with a single question I think I need like a step by step instruction on how to factorise, with an example. I get it once and then I literally forget when we go over it or it comes in an exam question! I know it’s a pain but if you could help... thanks
    http://lmgtfy.com/?q=how+to+factorise
    Offline

    16
    ReputationRep:
    You start by multipying everything in the brackets together. For example:
    (x+1)^2
    x*x=x^2
    x*1=x
    x*1=x
    1*1=1
    You then add the terms to get x^2=2x+1
    you can then factorise in a number of different ways for example you might want to complete the square or factorise a quadratic.

    To factorise a simple expression you remove all of one thing for example x from the terms that contain it and place those terms in some brackets where they are multiplied by what you removed.

    Example

    x^3+3x^2+6x=0

    you remove an x from each term to get x(x^2+3x+6)=0

    If i had thought ahead i would have chose a term that would then be factorisable again but this had complex roots.

    Lets choose say x^2 + 7x+12=0
    (ax^2+bx+c)

    you list the factors of 12(c)
    3*4
    1*12
    2*6
    and look for factors that add/ subtract to equal 7(b)
    For this question it would be 3 and 4
    so (x+3)(x+4) multiplied together equal X^2+7X+12=0
    therefore x = -3 and -4 a they are the values that the equation equals 0.


    If you need more help or my maths was wrong/ambiguous just ask/tell me.
    • Thread Starter
    Offline

    10
    ReputationRep:
    Thanks! 👍🏽👍🏽
 
 
 
The home of Results and Clearing

3,598

people online now

1,567,000

students helped last year

University open days

  1. SAE Institute
    Animation, Audio, Film, Games, Music, Business, Web Further education
    Thu, 16 Aug '18
  2. Bournemouth University
    Clearing Open Day Undergraduate
    Fri, 17 Aug '18
  3. University of Bolton
    Undergraduate Open Day Undergraduate
    Fri, 17 Aug '18
Poll
Will you be tempted to trade up and get out of your firm offer on results day?
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.