We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
0
202
1
avatar+569 

need help pls 

 Feb 22, 2018
 #1
avatar+99586 
+2

2.   The center is  (-1,1)

 

a) Note that the point  (-1,4)  is also on the graph...and the distance between this point and the center is jthe radius....this is given by the difference of the y coordinates   ( 4 - 1)  =  3

 

b) 

Graphing form  

 (x + 1)^2  + (y - 1)^2  =   9

 

Gerenral form...expand the graphing form

 

x^2 + 2x + 1 + y^2 - 2y + 1   = 9

 

x^2 + y^2 + 2x - 2y + 2  =  9           subtract 9 from both sides

 

x^2 + y^2 + 2x - 2y  - 7   =  0

 

 

cool cool cool

 Feb 22, 2018

22 Online Users

avatar
avatar