Turn on thread page Beta
    • Thread Starter
    Offline

    0
    ReputationRep:
    Find the first 3 terms in the expanision.
    (x+4)/(1+3x)^2

    So far I've done
    (x+4)(1+3x)^-2

    I'm confused for the next step.
    • Community Assistant
    Offline

    20
    ReputationRep:
    Community Assistant
    (Original post by Ggvvf)
    Find the first 3 terms in the expanision.
    (x+4)/(1+3x)^2

    So far I've done
    (x+4)(1+3x)^-2

    I'm confused for the next step.
    Perform binomial expansion on both terms up to the first 3 terms you need then multiply them together and collect the terms you require.
    • Very Important Poster
    Offline

    21
    ReputationRep:
    Very Important Poster
    (Original post by Ggvvf)
    Find the first 3 terms in the expanision.
    (x+4)/(1+3x)^2

    So far I've done
    (x+4)(1+3x)^-2

    I'm confused for the next step.
    What would help is for you to define clearly to yourself what the 'first 3 terms' means in term of powers of x and then use that when you are expanding things out, which is what you need to do with the ^-2 now.
 
 
 
The home of Results and Clearing

3,737

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.