A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

Algebra question?

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

    Decide whether or not the equation has a circle as its graph. If it does, give the center a\[x^2+y^2-6x+2y=-9\]nd the radius. If it does not, describe the graph.

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

    I know I need to rewrite into center radius form but i only get this far: \[(x^2-6x)+(y^2+2y)=-9\]

  3. nincompoop
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    what is the general form for circle?

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

    \[(x-h)^2+(y-k)^2=r^2\] ?

  5. nincompoop
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    does yours look like that?

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

    no:(

  7. nincompoop
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    http://www.mathsisfun.com/algebra/circle-equations.html there you have it

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

    \[(x-6)^2+(y-2)^2=-9^2\]

  9. nincompoop
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    can you expand the left hand side?

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

    wait, it'd be x+6 right? not x-6

  11. nincompoop
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    you complete the squares

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

    \[(x+6)^2+(y-2)^2=-9^2\]

  13. nincompoop
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    look at the link I shared it shows you step by step using similar problem

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

    ok hang on

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

    I am closing to finding the answer will you tell me if its right?

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

    Ok, I got (3,-1) and now cant figure out to how find the radius?

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

    @nincompoop

  18. dehelloo
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    hmm https://www.youtube.com/watch?v=qh5hNY83UA4 is an accurate video that follows up the process

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

    am I completely wrong? :/ I have trouble with longer problems. can anyone solve this exact problem so I can see where I went wrong?

  20. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Can anyone just give me answer at least? Trying to finish my homework up and this is my last problem left.

  21. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @nincompoop @dehelloo

  22. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    AFK.

  23. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    he died ?? ;-; nin!!

  24. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Haha I don't know what happened!

  25. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \(\color{blue}{\text{Originally Posted by}}\) @rawrolivia \[(x+6)^2+(y-2)^2=-9^2\] \(\color{blue}{\text{End of Quote}}\) you didn't complete the square

  26. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I'll show you what I did. Give me a moment to type it all

  27. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    okay

  28. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    \[x^2+y^2-6x+2y=-9 --> (x^2-6x+9)+(y^2+2y+1)=-9+9+1\] \[(x-3)^2+(y+1)^2=1\] (3,-1)

  29. Peridot
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ...I think I got the answer but I'm unsure. Sorry I've been meaning to reply for awhile but uh.. I probably got it wrong but this is what I got from it: Center of the circle is: C = (-6, 2) Radius of the circle is 9.

  30. Peridot
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ...I think I got the answer but I'm unsure. Sorry I've been meaning to reply for awhile but uh.. I probably got it wrong but this is what I got from it: Center of the circle is: C = (-6, 2) Radius of the circle is 9.

  31. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yes your work is correct remember to complete the square we should we should divide b by 2 and then add (b/2)^2 to the opposite side that's how u got +9 and 1 at right side -9+9+1= 1 so yes your work is correct good job!

  32. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok but @peridot got a different answer :/

  33. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[x^2+y^2-6x+2y=-9 --> (x^2-6x+\color{Red}{9})+(y^2+2y+1)=-9+9+1\] how did you get 9 ? explain

  34. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    -6 = -3, -3^2 =9

  35. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    -6=-3 ? is there a typo ?

  36. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I thought you had to take half of the middle number, and then square it

  37. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    oh yes so -6/2 = -3 -6 isn't equal to -3 alright and yes (-3)^2 =9 and like i said you should (b/2)^2 to the right side \[x^2+y^2-6x+2y=-9 --> (x^2-6x+\color{Red}{9})+(y^2+2y+1)=-9+\color{ReD}{9}+1\]

  38. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    and same thing with one you take half of the middle term 2/2 =1 and then take square add to the right side \[x^2+y^2-6x+2y=-9 --> (x^2-6x+\color{Red}{9})+(y^2+2y+1)=-9+\color{ReD}{9}+\color{blue}{1}\] -9+9 +1 = 1 so if your work is correct then obviously your answer is correct

  39. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok but I need to find out what the radius is now

  40. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \(\color{blue}{\text{Originally Posted by}}\) @rawrolivia \[(x-h)^2+(y-k)^2=r^2\] ? \(\color{blue}{\text{End of Quote}}\) general form of the circle write where r is the radius

  41. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    now compare your equation with that general form what is the radius in that equation ?

  42. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    So radius is 1?

  43. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    going to walmart, can i just please have answer? this is confusing me more than it should :(

  44. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \(\color{blue}{\text{Originally Posted by}}\) @rawrolivia So radius is 1? \(\color{blue}{\text{End of Quote}}\) yes right

  45. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    you already know the answer..

  46. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[(x-h)^2+(y-k)^2=r^2\] general form of the circle write where r is the radius and (h,k) is the center

  47. nincompoop
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I went to school to attend a session. Sorry. Let me know if you want to further learn or go over about circles.

  48. 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.