Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

hoopshiree Group Title

what is the value of b x^2+y^2+ax+by+c=0

  • 10 months ago
  • 10 months ago

  • This Question is Closed
  1. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    the value of \(b\) for what?

    • 10 months ago
  2. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    for that equation, \[x ^{2}+y ^{2^{}}+ax+by+c=0\]

    • 10 months ago
  3. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    @helder_edwin

    • 10 months ago
  4. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    r u sure the question is exactly that? it kind of doesn't make sense

    • 10 months ago
  5. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    this graph is part of the question

    • 10 months ago
  6. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    u also need to find the values of a, b, and c so that the equation describes the circle of the figure. complete both squares. u know the center and the radius of the circle (see the graph)

    • 10 months ago
  7. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    that doesnt help me

    • 10 months ago
  8. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    but thanks

    • 10 months ago
  9. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    do u know how to complete the square?

    • 10 months ago
  10. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    no

    • 10 months ago
  11. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    ok i will do it. first the center is C(-2,1) and r=3, do u agree?

    • 10 months ago
  12. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    yes

    • 10 months ago
  13. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I got that far.

    • 10 months ago
  14. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    ok know, the equation of a circle should be \[\large (x-h)^2+(y-k)^2=r^2 \] we have to make the equation \[\large x^2+y^2ax+by+c=0 \] to resemble this. OK?

    • 10 months ago
  15. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    \[\large x^2+y^2+ax+by+c=0 \]

    • 10 months ago
  16. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    (x+2)^2+(y-1)^2=3^2

    • 10 months ago
  17. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    we know that h=-2, k=1, and r=3, agree?

    • 10 months ago
  18. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    yes. expand that!

    • 10 months ago
  19. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    can u do it?

    • 10 months ago
  20. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    (x+2)+(x+2)+(y-1)+(y-1)=9?

    • 10 months ago
  21. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I'm so confuseddd.

    • 10 months ago
  22. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    no \[\large (x+2)^2+(y-1)^2=3^2 \] \[\large (x^2+4x+4)+(y^2-2x+1)=9 \] \[\large x^2+y^2+4x-2y+5=9 \] \[\large x^2+y^2+4x-2y-4=0 \]

    • 10 months ago
  23. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    got it?

    • 10 months ago
  24. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    so b is 4?

    • 10 months ago
  25. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    no, b is the coefficient of \(y\)

    • 10 months ago
  26. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    oh -2?

    • 10 months ago
  27. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    yes

    • 10 months ago
  28. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    can you help me with this one?

    • 10 months ago
  29. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    same question?

    • 10 months ago
  30. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    have to find a now. so the center is (-1,3) and radius is 4 right?

    • 10 months ago
  31. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    (x+1)+(y-3)=16?

    • 10 months ago
  32. RadEn Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    correction number one, the centre of circle is (1,-2) not (-2,1). so, h = 1 and k = -2 now remember the equation of circle is x^2 + y^2 +ax + by + c = 0 or (x - h)^2 + (y -k)^2 = 0 h,k is the centre of circle. the relation of b and k is b = -1/2(k) so, b = -1/2(-2) = 1

    • 10 months ago
  33. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    YES. I am so sorry, my mistake.

    • 10 months ago
  34. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    oh boy. okay.

    • 10 months ago
  35. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    in the second case the center is (3,-1) and r=4

    • 10 months ago
  36. RadEn Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    correction again, im not a boy, but a father of that boy ;p

    • 10 months ago
  37. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    does A have a certain formula that can be used to find it?

    • 10 months ago
  38. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    dont learn formulas, learn concepts. do what i did before: expand \[\large (x-3)^2+(y+1)^2=4^2 \] it should take a minute

    • 10 months ago
  39. SnuggieLad Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Welcome To Openstudy

    • 10 months ago
  40. RadEn Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    a = -1/2 * h

    • 10 months ago
  41. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    so (x^2-6x+9)+(y^2+2x+1)=16?

    • 10 months ago
  42. hoopshiree Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    so a would be = -3 1/2

    • 10 months ago
  43. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    a=-6, that is what u got.

    • 10 months ago
  44. ranga Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    It should be (x^2-6x+9)+(y^2+2y+1)=16 (you had 2x, it should be 2y). In bx^2+y^2+ax+by+c=0, a is the coefficient of x. The coefficient of x in the equation you got is -6 So a = -6.

    • 10 months ago
    • Attachments:

See more questions >>>

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.