A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 5 years ago

Can you help me to find the center and the radio of the following circle. (2x^2)+(2y^2)-8x+12y-28=0

  • This Question is Closed
  1. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    CENTRE IS (2,-3) radius squareroot(42)

  2. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    is dis d ans tel

  3. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    dont know. Can you teach me how to? Dont care about the answer

  4. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    step by step

  5. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    k first divide eqn by 2 so that there is no coefficient of x^2 and y^2

  6. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    what if I have a 2 in x^2 and a 3 in y^2?

  7. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i dont thnk thats possible bcoz coefficient of x^2 is always equal to coefficient of y^2 in a circle

  8. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    nice. So after dividing the equation by 2 I got: x^2+y^2-4x+y-14=0 what else should i do?

  9. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    then compar with eqn x^2 +y^2 +2gfx+2hy+c=0 we see -4x=2gfx n 6y=2hy g=-2 n h=3 centre(-g,-h) (2,-3) n radius r^2=g^2 +h^2-c r^2=4+9+14 r^2=27 r=3\[\sqrt{3}\]

  10. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    got it

  11. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    checking it out :) till now yes

  12. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Ok in the third line you state that -4x=2gfx and in the next g=-2. how do you get rid of f?

  13. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    srry there is no f remove wherever i hav used

  14. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok

  15. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    hapy it helpd u

  16. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    According to what I understand, we have to leave x^2 and y^2 with coefficient 1. Is that correct?

  17. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Then we have to match the equation with x^2 +y^2 +2gfx+2hy+c=0.

  18. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    find the values of g and h and we get the radius.

  19. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    sorry the center

  20. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.