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

    3
    ReputationRep:
    Can anyone help me answer this question, or just or the steps to do this, not too sure and hope you can understand it


    The line
    y +2x=k
    where
    k > 0 is a tangent to the circle with equation
    x squared + y squared -2x -4 (circle eqn)
    a) Find the value of k.
    b) Deduce the coordinates of the point of contact.
    •  Official Rep
    Offline

    15
    ReputationRep:
     Official Rep
    Sorry you've not had any responses about this.

    Why not try posting in a specific subject forum- you might have more luck there.

    Here's a link to our subject forum which should help get you more responses.

    Offline

    3
    ReputationRep:
    (Original post by Misshussain23)
    Can anyone help me answer this question, or just or the steps to do this, not too sure and hope you can understand it


    The line
    y +2x=k
    where
    k > 0 is a tangent to the circle with equation
    x squared + y squared -2x -4 (circle eqn)
    a) Find the value of k.
    b) Deduce the coordinates of the point of contact.
    If its a tangent, then the circle and the line only intersect once.

    What you can hence do is form an equation that will allow you to find the coordinates of intersection in terms of k and use your knowledge of the discriminant to work out what k is.

    Have a go
    Offline

    1
    ReputationRep:
    (Original post by kingaaran)
    If its a tangent, then the circle and the line only intersect once.

    What you can hence do is form an equation that will allow you to find the coordinates of intersection in terms of k and use your knowledge of the discriminant to work out what k is.

    Have a go
    You're a savage dude. You're only ever on this site late at night, do you sleep?
    Offline

    3
    ReputationRep:
    (Original post by StopBanningDuck)
    You're a savage dude. You're only ever on this site late at night, do you sleep?
    My night is your day
    Offline

    1
    ReputationRep:
    (Original post by kingaaran)
    My night is your day
    That is some real vampire s h i t right there :afraid:
    Offline

    3
    ReputationRep:
    (Original post by StopBanningDuck)
    That is some real vampire s h i t right there :afraid:
    Haha, what a lad


    Posted from TSR Mobile
    Offline

    1
    ReputationRep:
    . I meant to ask you this a long time ago, but mods kept banning me for no reason, so I had to chose the right time to resurrect myself. How did your Cambrige interview go?
    Offline

    3
    ReputationRep:
    (Original post by StopBanningDuck)
    . I meant to ask you this a long time ago, but mods kept banning me for no reason, so I had to chose the right time to resurrect myself. How did your Cambrige interview go?
    Meh, one was decent, the other was horrible.

    As you might know, I didn't get an offer. But idm, now I'm going to do maths and physics at Warwick and it equally excites me




    Posted from TSR Mobile
    Offline

    1
    ReputationRep:
    (Original post by kingaaran)
    Meh, one was decent, the other was horrible.

    As you might know, I didn't get an offer. But idm, now I'm going to do maths and physics at Warwick and it equally excites me




    Posted from TSR Mobile
    Their lost, I guess. The interviews were not formal right? So, they asked you questions relating to maths?
    Offline

    3
    ReputationRep:
    (Original post by StopBanningDuck)
    Their lost, I guess. The interviews were not formal right? So, they asked you questions relating to maths?
    Yeah, just maths


    Posted from TSR Mobile
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by kingaaran)
    If its a tangent, then the circle and the line only intersect once.

    What you can hence do is form an equation that will allow you to find the coordinates of intersection in terms of k and use your knowledge of the discriminant to work out what k is.

    Have a go
    Thanks so much! It makes much more sense now
 
 
 
  • 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
    Have you ever participated in a Secret Santa?
    Help with your A-levels

    All the essentials

    The adventure begins mug

    Student life: what to expect

    What it's really like going to uni

    Rosette

    Essay expert

    Learn to write like a pro with our ultimate essay guide.

    Uni match

    Uni match

    Our tool will help you find the perfect course for you

    Study planner

    Create a study plan

    Get your head around what you need to do and when with the study planner tool.

    Study planner

    Resources by subject

    Everything from mind maps to class notes.

    Hands typing

    Degrees without fees

    Discover more about degree-level apprenticeships.

    A student doing homework

    Study tips from A* students

    Students who got top grades in their A-levels share their secrets

    Study help links and info

    Can you help? Study help unanswered threadsRules and posting guidelines

    Sponsored content:

    HEAR

    HEAR

    Find out how a Higher Education Achievement Report can help you prove your achievements.

    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.