nincompoop
  • nincompoop
circle and radius
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
what about them?
Psymon
  • Psymon
Er....
nincompoop
  • nincompoop
\[x^2 +y^2+6x-2y+1=0\] |dw:1378177855601:dw|

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anonymous
  • anonymous
and what's the problem?
nincompoop
  • nincompoop
radius?
anonymous
  • anonymous
oh. well you have a -9 in there
anonymous
  • anonymous
i think you just forgot about that when you went to h, k...
anonymous
  • anonymous
i'm not sure but maybe r^2 equals 9, and that means r is 3. it's been so long since geometry, i forgot quite a bit :P
nincompoop
  • nincompoop
i know it is r=3
anonymous
  • anonymous
ok, does that solve your problem?
nincompoop
  • nincompoop
there's something amiss… I can't figure out
anonymous
  • anonymous
something's amiss about what? it looks fine to me. its possible that you mixed up the signs (+/-) for h and k
nincompoop
  • nincompoop
nothing's mixed up center is (-3, 1)
Psymon
  • Psymon
Youre picking wrong things to add and subtract. You did all the completing the square stuff correctly, but you are supposed to have + 9 on the other side. If you do (x+3)^2, then you added a 9 on the left side, which means you have to add a 9 on the right side as well. For the the next one, (y-1)^2 means you added a 1 on the left, so you add 1 on the right as well. This means you have: \[(x+3)^{2}+(y-1)^{2}+1 = 10\]Probably less confusing if instead of subtracting on the left after you complete the square that you just add on the right.
anonymous
  • anonymous
despite that, you still have all the right values ( center IS (-3, 1), and radius IS 3, i just graphed it to double check)
nincompoop
  • nincompoop
YEAH that's it! lol
nincompoop
  • nincompoop
I think I wrote something down incorrectly…
Psymon
  • Psymon
Possibly. But I just find it less confusing to add to the other side instead of subtracting from the current side :P
nincompoop
  • nincompoop
why did you leave out +1 on the left side, though it's still correct in the end. where did it come from?
Psymon
  • Psymon
I just never touched it when I did complete the square. I have no reason to do anything to do it, I can just choose to move it to the right now or later: \[(x ^{2}+6x + ?) + (y ^{2}-2y + ?) + 1 = ? + ? \]Same set up, but no reason to mess with the 1. \[(x ^{2}+6x + 9) + (y ^{2}-2y + 1) + 1 = 9 + 1\] \[(x+3)^{2}+(y-1)^{2} = 9\]Whatever works for you.
nincompoop
  • nincompoop
that's what I thought… I touched it and I think that's where I was going bonkers
Psymon
  • Psymon
As little as I have to mess with the better xD
nincompoop
  • nincompoop
arrigatooooo!!!
Psymon
  • Psymon
どういたしましてね!

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