Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
lissafi
Group Title
show that the two circlex^2+y^24x2y11=0 and x^2+y^2+20x12y+72=0 do not intersect.Hint;find the distance between their centers
 one year ago
 one year ago
lissafi Group Title
show that the two circlex^2+y^24x2y11=0 and x^2+y^2+20x12y+72=0 do not intersect.Hint;find the distance between their centers
 one year ago
 one year ago

This Question is Closed

wio Group TitleBest ResponseYou've already chosen the best response.0
Use completing the square to get them both in the form of :\[ (xh)^2+(yk)^2=r^2 \]
 one year ago

wio Group TitleBest ResponseYou've already chosen the best response.0
For example: \[ x^24x = (x2)^24 \]
 one year ago

lissafi Group TitleBest ResponseYou've already chosen the best response.0
i still cant work it wio
 one year ago

Yahoo! Group TitleBest ResponseYou've already chosen the best response.2
General equation: x^2 + y^2 +2gx + 2hy + c=0 Centre ( g,f)
 one year ago

Yahoo! Group TitleBest ResponseYou've already chosen the best response.2
x^2+y^24x2y11=0 Centre (2,1)
 one year ago

Yahoo! Group TitleBest ResponseYou've already chosen the best response.2
x^2+y^2+20x12y+72=0 Centre (10,6)
 one year ago

Yahoo! Group TitleBest ResponseYou've already chosen the best response.2
Hope this will help u..
 one year ago

wio Group TitleBest ResponseYou've already chosen the best response.0
Still gotta find radius though. @Yahoo!
 one year ago

Yahoo! Group TitleBest ResponseYou've already chosen the best response.2
\[r=\sqrt{g^2+f^2c}\]
 one year ago

wio Group TitleBest ResponseYou've already chosen the best response.0
You really learn that in class?
 one year ago

lissafi Group TitleBest ResponseYou've already chosen the best response.0
@yahoo how do u get the center x^2+y^2+20x12y+72=0 Centre (10,6)?
 one year ago

Yahoo! Group TitleBest ResponseYou've already chosen the best response.2
Compare it with the General equation..
 one year ago

Yahoo! Group TitleBest ResponseYou've already chosen the best response.2
x^2 + y^2 + 2gx + 2fy + c=0 C ( g,f) so Here x^2+y^2+20x12y+72=0 2g = 20 g = 10 2f = 12 f = 6 Since the Centre is g,f C ( 10 ,  (6) ) C ( 10 , 6)
 one year ago

wio Group TitleBest ResponseYou've already chosen the best response.0
@lissafi Do you know how to complete the square?
 one year ago

lissafi Group TitleBest ResponseYou've already chosen the best response.0
not on this
 one year ago

wio Group TitleBest ResponseYou've already chosen the best response.0
Just ignore the \(y\) terms and try to complete the square for (x\), then ignore the \(x\) terms and complete the square for \(y\)
 one year ago

lissafi Group TitleBest ResponseYou've already chosen the best response.0
wio is that what yahoo did?cos i am lost on this method
 one year ago

wio Group TitleBest ResponseYou've already chosen the best response.0
I dunno what Yahoo! did...
 one year ago

wio Group TitleBest ResponseYou've already chosen the best response.0
\[ x^2+y^24x2y11=0 \]Okay so we just ignore the \(y\) terms... \[ x^24x11=0 \]How do you complete the square here?
 one year ago

lissafi Group TitleBest ResponseYou've already chosen the best response.0
wio i dont know much on completing the square
 one year ago

Yahoo! Group TitleBest ResponseYou've already chosen the best response.2
x^2+y^24x2y11=0 x^24x + y^2 2y = 11 x^2  4x + 4 + y^2  2y + 1 = 11 + 4 + 1 (x2)^2 + (y1)^2 = 16 (x2)^2 + (y1)^2 = 4^2 now it is a circle with centre (2,1) and radius 4
 one year ago

Yahoo! Group TitleBest ResponseYou've already chosen the best response.2
@lissafi u got it..now
 one year ago

lissafi Group TitleBest ResponseYou've already chosen the best response.0
yap,and for x^2+y^2+20x12y+72=0?
 one year ago

Yahoo! Group TitleBest ResponseYou've already chosen the best response.2
Try it out...
 one year ago

lissafi Group TitleBest ResponseYou've already chosen the best response.0
i lost in (x2)^2 + (y1)^2 = 16
 one year ago

lissafi Group TitleBest ResponseYou've already chosen the best response.0
i know you add +4+1 on both side
 one year ago

Yahoo! Group TitleBest ResponseYou've already chosen the best response.2
Since we added 4 and 1 on LHS we have to do in RHS tooooo
 one year ago

lissafi Group TitleBest ResponseYou've already chosen the best response.0
i know you can find x to subtitute to get y and have the points,but i dont know this method
 one year ago

sirm3d Group TitleBest ResponseYou've already chosen the best response.0
in \[x^2+y^2+20x12y+72=0\] what term must be added to \[x^2+20x\] to get a perfect square trinomial that can be written in the form \[(x+\_\_)^2\]
 one year ago
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
 Engagement 19 Mad Hatter
 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.