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equation of a circle  TOPIC_SOLVED

Need help with finding the center radius form of the circle 9x^+9y^+18y-12y-131=0. I can work these out when I can factor out the same number but, this one is giving me trouble.
Alan
by prealan01
on Fri Mar 02, 2012 1:41 am
 
Forum: Advanced Algebra ("pre-calculus")
Topic: equation of a circle
Replies: 5
Views: 1676

Re: equation of a circle  TOPIC_SOLVED

I made a typo, sorry. If I rearrange it to read 9x^+18x+9y^-12y=131 I know I need to factor out a number before completing the square on both sides, but if I factor out a 3 it's got me confused. Example: 4x^+12x+4y^+24y-99=0 move the 99 and factor out a 4, then complete the square both sides 4(x^+3x...
by prealan01
on Fri Mar 02, 2012 9:13 pm
 
Forum: Advanced Algebra ("pre-calculus")
Topic: equation of a circle
Replies: 5
Views: 1676

Re: equation of a circle  TOPIC_SOLVED

That's where I'm having a problem. You can't factor out 9 because of the -12y. This problem isn't working out just as the other one I gave as an example.
Alan
by prealan01
on Sat Mar 03, 2012 4:09 am
 
Forum: Advanced Algebra ("pre-calculus")
Topic: equation of a circle
Replies: 5
Views: 1676

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