Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    2
    ReputationRep:
    https://57a324a1a586c5508d2813730734...%20Edexcel.pdf

    can someone help me with 7c? ive tried drawing the rectangle but im getting nowhere
    Offline

    2
    ReputationRep:
    (Original post by imran_)
    https://57a324a1a586c5508d2813730734...%20Edexcel.pdf

    can someone help me with 7c? ive tried drawing the rectangle but im getting nowhere
    Ive done this q

    Basically how i saw it was that length of one side was x and the other side (9-x) and so the area R was x(9-x) =9x- (x^2) so A=-1 and B=9
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by TheSammy2010)
    Ive done this q

    Basically how i saw it was that length of one side was x and the other side (9-x) and so the area R was x(9-x) =9x- (x^2) so A=-1 and B=9
    why was it 9-x?
    • Study Helper
    Offline

    13
    Study Helper
    (Original post by imran_)
    why was it 9-x?
    Because two sides are made up of two pieces of string formed by cutting a piece of length 9 into two. So, one has length x, and the other 9-x.
    Offline

    2
    ReputationRep:
    (Original post by imran_)
    why was it 9-x?
    The total length is 9 and a set distance which is a variable is given x, and since both lengths of string need to add up to the total, it much be (9-x). It works mathematicallu. x + 9-x = 9
 
 
 
  • 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
    Would you like to hibernate through the winter months?
    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.