Join TSR now and get all your revision questions answeredSign up now
    • Thread Starter
    Offline

    0
    ReputationRep:
    Name:  IMG_3609.jpg
Views: 26
Size:  473.3 KB

    got a question that's bugging me x100

    it's 2b)

    i'd appreciate any help
    Offline

    3
    ReputationRep:
    Expand both the brackets
    collect like terms
    factorise
    Offline

    14
    ReputationRep:
    Expand the (1+x)^4 then think what differences (1-x)^4 would have
    • Very Important Poster
    Online

    21
    ReputationRep:
    (Original post by nitrogenousBase)
    Name:  IMG_3609.jpg
Views: 26
Size:  473.3 KB

    got a question that's bugging me x100

    it's 2b)

    i'd appreciate any help
    You can save yourself a lot of work by using 2a.

    So what is the link between the expansiom of (1+x) and (1-x), without calculating it like in 2a?
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by SeanFM)
    You can save yourself a lot of work by using 2a.

    So what is the link between the expansiom of (1+x) and (1-x), without calculating it like in 2a?
    Is it not essentially the same expansion except with certain terms of negative value?
    • Community Assistant
    • Welcome Squad
    Offline

    17
    ReputationRep:
    (Original post by nitrogenousBase)

    got a question that's bugging me x100

    it's 2b)

    i'd appreciate any help
    (Original post by SeanFM)
    You can save yourself a lot of work by using 2a.

    So what is the link between the expansiom of (1+x) and (1-x), without calculating it like in 2a?
    Difference of two squares cleans it up pretty quickly.
    Offline

    21
    ReputationRep:
    (Original post by nitrogenousBase)
    Is it not essentially the same expansion except with certain terms of negative value?
    Indeed!
 
 
 
Poll
Which web browser do you use?
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

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