Hey there! Sign in to join this conversationNew here? Join for free
    • Community Assistant
    • Welcome Squad
    Offline

    20
    ReputationRep:
    (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})
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Did TEF Bronze Award affect your UCAS choices?
    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
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • 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.