Turn on thread page Beta

Binomial expansion with 2 brackets?? Help! watch

    • Community Assistant
    Offline

    20
    ReputationRep:
    Community Assistant
    (Original post by Jones3211)
    I’m doing AS level maths with AQA and this question is in my text book but I have no idea how to do it, please help!
    The question is...
    Find the coefficient of x^4 in the expansion of (1+x)(2x-3)^5
    I have no idea how to begin, the answer is in the back of the book but it doesn’t lead me to how to get it, just displays the final answer.
    Any help is appreciated!
    (1+x)(2x-3)^5=(2x-3)^5+x(2x-3)^5

    Get the expansion for (2x-3)^5 up to x^4. Then replace the first term by the x^4 term of the expansion, and replace the second term by x \times ( x^3 \ \text{term of the expansion})
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: November 3, 2017
The home of Results and Clearing

1,342

people online now

1,567,000

students helped last year
  • create my feed
  • edit my feed

University open days

  1. Keele University
    General Open Day Undergraduate
    Sun, 19 Aug '18
  2. University of Melbourne
    Open Day Undergraduate
    Sun, 19 Aug '18
  3. Sheffield Hallam University
    City Campus Undergraduate
    Tue, 21 Aug '18
Poll
A-level students - how do you feel about your results?
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.