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

    0
    ReputationRep:
    I found out p which is = 7.2 but what about Q?
    I tried Pythagoras theorem, trapezium area, similarity. Got wrong answers.
    Can someone tell me how to solve it ?
    In the Mark scheme, Q is 6.4 ???


    Posted from TSR Mobile
    Attached Images
      
    • Study Helper
    Offline

    13
    Study Helper
    (Original post by justwork)
    ...
    Similiar triangles is the way to go.

    What's your working when you've tried this method?
    • Thread Starter
    Offline

    0
    ReputationRep:
    Anyone ?



    Posted from TSR Mobile
    Offline

    1
    ReputationRep:
    (Original post by justwork)
    I found out p which is = 7.2 but what about Q?
    I tried Pythagoras theorem, trapezium area, similarity. Got wrong answers.
    Can someone tell me how to solve it ?
    In the Mark scheme, Q is 6.4 ???


    Posted from TSR Mobile
    Did you remember to subtract 8 at the end (as it wants the value of q, not the side length).
    Offline

    19
    ReputationRep:
    Do you know how scale factors work?
    Offline

    16
    ReputationRep:
    (Original post by justwork)
    I found out p which is = 7.2 but what about Q?
    I tried Pythagoras theorem, trapezium area, similarity. Got wrong answers.
    Can someone tell me how to solve it ?
    In the Mark scheme, Q is 6.4 ???


    Posted from TSR Mobile
    As has been said, similar triangles

    Draw ABE and ACD out as separate triangles then use AE to find AD
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by ghostwalker)
    Similiar triangles is the way to go.

    What's your working when you've tried this method?
    So i should so 2 similar triangles ?1 big and 1 small ?


    Posted from TSR Mobile
    • Thread Starter
    Offline

    0
    ReputationRep:
    Ok will do that


    Posted from TSR Mobile
    • Thread Starter
    Offline

    0
    ReputationRep:
    I stopped here, a bit uncertain what should i do next ?


    Posted from TSR Mobile
    Attached Images
     
    Offline

    16
    ReputationRep:
    (Original post by justwork)
    I stopped here, a bit uncertain what should i do next ?
    Oh dear

    Look at the question
    No right angles

    You already know AE

    The triangles are similar ... use your method from the first part
    • Thread Starter
    Offline

    0
    ReputationRep:
    Just one more question about vectors, my main problem in that question was how should I start it ?
    How can I find VW ?


    Posted from TSR Mobile
    Attached Images
      
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by TenOfThem)
    Oh dear

    Look at the question
    No right angles

    You already know AE

    The triangles are similar ... use your method from the first part
    Ok the facts are : just length similarity. So do you do 7.2/4 = 1.8
    1.8 x 6.4= 11.52 ? Am I headed in the right direction ??


    Posted from TSR Mobile
    Offline

    16
    ReputationRep:
    (Original post by justwork)
    Just one more question about vectors, my main problem in that question was how should I start it ?
    How can I find VW ?
    That is a very odd question but

    a = \begin{pmatrix} 2 \\ 2  \end{pmatrix}

    b = \begin{pmatrix} 2 \\ -2  \end{pmatrix}

    and you need to combine those to give

    VW = \begin{pmatrix} 4 \\ 0  \end{pmatrix}
    Offline

    16
    ReputationRep:
    (Original post by justwork)
    Ok the facts are : just length similarity. So do you do 7.2/4 = 1.8
    1.8 x 6.4= 11.52 ? Am I headed in the right direction ??


    Posted from TSR Mobile
    No, where does 6.4 come from
    • Thread Starter
    Offline

    0
    ReputationRep:
    But they are asking in terms of a and b ??


    Posted from TSR Mobile
    Offline

    16
    ReputationRep:
    (Original post by justwork)
    But they are asking in terms of a and b ??


    Posted from TSR Mobile
    I know

    Are you seriously saying that you cannot see how to combine a and b to give that answer?
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by TenOfThem)
    No, where does 6.4 come from
    If q is 11.52 how come in the mark scheme it was 6.4 for q ? This bit is abit puzzling to me ? Could it be that MS is wrong or we made a mistake ?


    Posted from TSR Mobile
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by TenOfThem)
    I know

    Are you seriously saying that you cannot see how to combine a and b to give that answer?
    I know how to do those, im just confused !!


    Posted from TSR Mobile
    Offline

    16
    ReputationRep:
    (Original post by justwork)
    If q is 11.52 how come in the mark scheme it was 6.4 for q ? This bit is abit puzzling to me ? Could it be that MS is wrong or we made a mistake ?


    Posted from TSR Mobile
    q is not 11.52

    The MS is correct
    Offline

    16
    ReputationRep:
    (Original post by justwork)
    I know how to do those, im just confused !!


    Posted from TSR Mobile
    Look at the way have written the vectors

    Look at a and b

    You need to make \begin{pmatrix} 4 \\ 0 \end{pmatrix} out of them ... it is pretty easy
 
 
 
Poll
Do you agree with the PM's proposal to cut tuition fees for some courses?
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.