Mitchi35
  • Mitchi35
3) Graph the circle x2+ (y + 2)2= 9. Label the center and at least four points on the circle.
Mathematics
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SOLVED
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schrodinger
  • schrodinger
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Mitchi35
  • Mitchi35
Number 3 please? Thanks!
Loser66
  • Loser66
what is the standard form of a circle?
Mitchi35
  • Mitchi35
(x-h)^2+(y-v)^2=r2

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Loser66
  • Loser66
now compare to your expression, \(x^2 +(y+2)^2=9\) , then h =? k =? r =?
Mitchi35
  • Mitchi35
Okay....Wait. But How can I figure out the center points?
Loser66
  • Loser66
Why don't you answer me?:
Mitchi35
  • Mitchi35
Well geez. Alright.
Mitchi35
  • Mitchi35
I don't even understand what you are asking me to do.
Loser66
  • Loser66
Since you skip it, you don't know how to find the center. I realize that fact right after you ask me what is the center although you said ok before.
Mitchi35
  • Mitchi35
Not with this question no.
Loser66
  • Loser66
ok, slower. Do you agree with me that \(x^2 = (x-0)^2\)?
Mitchi35
  • Mitchi35
Yeah I guess
Mitchi35
  • Mitchi35
Yes I do.
Loser66
  • Loser66
and \((y +2) = y-(-2) \) , ok?
Mitchi35
  • Mitchi35
Yes
Loser66
  • Loser66
9 = 3^2 ok?
Mitchi35
  • Mitchi35
Ok
Loser66
  • Loser66
Compare the standard form of a circle with your problem: \[(x -\color{red}{h})^2 +(y -\color{blue}{k})^2 =\color{purple}{r}^2\\(x -\color{red}{0})^2 +(y -\color{blue}{(-2)})^2 =\color{purple}{3}^2\] Can you tell me h, k,r on your problem are?
Mitchi35
  • Mitchi35
Oh! Omg! Nevermind! I have it figured out. It's right here in my book. I had to dig to find it. But thank you! Do you want me to share it with you anyway?

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