Just one sec...
Hey! Sign in to get help with your study questionsNew here? Join for free to post

Graph question (2 marks)

Announcements Posted on
Take our short survey, £100 of Amazon vouchers to be won! 23-09-2016
    • Thread Starter
    Offline

    2
    Hi can someone explain/ go through how you would go through a question like this?

    Thanks.

    Name:  question 12.png
Views: 102
Size:  24.7 KB
    Offline

    1
    ReputationRep:
    I've had a crack at the first 2. I'm not sure though

    I solved the equation for y to get x and got 4 and -4.

    Therefore A is (-4,0) and B is (4,0)

    For the second part I used the distance formula... and got 8.


    For the 3rd part... I'm thinking to use dy/dx........
    When I use it, I then put in -4 for the x value to get the deepest point
    • Thread Starter
    Offline

    2
    (Original post by StanKing)
    I've had a crack at the first 2. I'm not sure though

    I solved the equation for y to get x and got 4 and -4.

    Therefore A is (-4,0) and B is (4,0)


    For the second part I used the distance formula... and got 8.


    For the 3rd part... I'm thinking to use dy/dx........
    When I use it, I then put in -4 for the x value to get the deepest point
    That bold part is correct, how did you solve it?
    Offline

    1
    ReputationRep:
    Ah, well, I expanded out the brackets (forget about the y=) and got

    3x^2/16 - 3.

    Then I made it equal to zero and got 3x^2/16=3

    Times the 16 by the 3 to get 3x^2=48

    Then divided both sides by 3 and got x^2=16

    Therefore x=(+-)4
    • Thread Starter
    Offline

    2
    (Original post by StanKing)
    Ah, well, I expanded out the brackets (forget about the y=) and got

    3x^2/16 - 3.

    Then I made it equal to zero and got 3x^2/16=3

    Times the 16 by the 3 to get 3x^2=48

    Then divided both sides by 3 and got x^2=16

    Therefore x=(+-)4
    Thanks for that
    • Thread Starter
    Offline

    2
    (Original post by StanKing)
    I've had a crack at the first 2. I'm not sure though

    I solved the equation for y to get x and got 4 and -4.

    Therefore A is (-4,0) and B is (4,0)

    For the second part I used the distance formula... and got 8.


    For the 3rd part... I'm thinking to use dy/dx........
    When I use it, I then put in -4 for the x value to get the deepest point
    For part 3 (iii) you use integration, but can someone go through it please?
    Thanks.
    Offline

    0
    ReputationRep:
    (Original post by blueray)
    For part 3 (iii) you use integration, but can someone go through it please?
    Thanks.
    To find area you always integrate for curves.

    Let me handwrite tit and then i will type up my method.
    • Thread Starter
    Offline

    2
    (Original post by GreenLantern1)
    To find area you always integrate for curves.

    Let me handwrite tit and then i will type up my method.
    Cheers!
    Offline

    0
    ReputationRep:
    (Original post by blueray)
    Cheers!
    Omg I just spent 20 mins typing it up in latex then when I went to press preview post for like the 10th time to check it was alright. The ****ing Internet randomly went now it is all gone!!! :rant:

    I am actually pissed off!!!!

    Basically, though just take the 3/16 out of the integrand and have it as a fraction. And change lower limit to 0 since it same as uppe rand times final answer ar 2. Simple as that!!
    Offline

    0
    ReputationRep:
    Btw could you please senfd me the specimen addmaths paper file as i do not have access to that.
    • Thread Starter
    Offline

    2
    (Original post by GreenLantern1)
    Omg I just spent 20 mins typing it up in latex then when I went to press preview post for like the 10th time to check it was alright. The ****ing Internet randomly went now it is all gone!!! :rant:

    I am actually pissed off!!!!

    Basically, though just take the 3/16 out of the integrand and have it as a fraction. And change lower limit to 0 since it same as uppe rand times final answer ar 2. Simple as that!!
    Umm could you type up the latex on microsfot word then post it here so if the internet goes at least it's on notepad or word SOrry I didn't understand a word you said!

    Sure I can give you the papers pm me
    Offline

    0
    ReputationRep:
    (Original post by blueray)
    Umm could you type up the latex on microsfot word then post it here so if the internet goes at least it's on notepad or word SOrry I didn't understand a word you said!

    Sure I can give you the papers pm me
    Ir would take so long to type it out again and I have to revise. Do you not have a markscheme to it.
    • Thread Starter
    Offline

    2
    (Original post by GreenLantern1)
    Basically, though just take the 3/16 out of the integral and have it as a fraction. And change lower limit to 0 since its same as upper and times final answer (ar) 2. Simple as that!!

    so [3/16] 4 on top and 0 on bottom? then times by 2??? Have you got a scanner or a camera can you take a pic of what you did on paper and upload it?

    Or email me When you are free, cuz I know you're revising
    • Thread Starter
    Offline

    2
    (Original post by GreenLantern1)
    ......
    so [3/16] 4 on top and 0 on bottom? then times by 2??? Have you got a scanner or a camera can you take a pic of what you did on paper and upload it?

    Or email me When you are free, cuz I know you're revising
    Offline

    0
    ReputationRep:
    (Original post by blueray)
    so [3/16] 4 on top and 0 on bottom? then times by 2??? Have you got a scanner or a camera can you take a pic of what you did on paper and upload it?

    Or email me When you are free, cuz I know you're revising
    I will have to email tomorrow with a picture of my working out mate!
    • Thread Starter
    Offline

    2
    (Original post by GreenLantern1)
    I will have to email tomorrow with a picture of my working out mate!
    It's cool bro I did it!
    Offline

    0
    ReputationRep:
    (Original post by blueray)
    It's cool bro I did it!
    Lol late much bro?
    Offline

    2
    ReputationRep:
    ROFL ^
    • Thread Starter
    Offline

    2
    (Original post by GreenLantern1)
    Lol late much bro?
    Did it to get your attention (look bellow

    (Original post by Azland)
    ROFL ^
    Can you do this green?

    http://www.thestudentroom.co.uk/show....php?t=1984928
    Offline

    0
    ReputationRep:
    (Original post by blueray)
    Did it to get your attention (look bellow



    Can you do this green?

    http://www.thestudentroom.co.uk/show....php?t=1984928
    Yes I can indeed.

    I see how to do it. Just do 1 - [P(O)+P(1)].

    Can't actually do it though now - in the middle of the Cambridge Chemistry Challenge
 
 
 
Write a reply…

Reply

Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. Oops, you need to agree to our Ts&Cs to register
  2. Slide to join now Processing…

Updated: May 1, 2012
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

Poll
Who will be the next permanent England boss?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read here first

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
Study resources

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

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.