+0  
 
0
71
1
avatar

 

2. A circle is centered at (11,-9) and has a radius of 12. 

What is the equation of the circle? Use lower case variables x and y.

 

8. A focus of a parabola is (3,-7) and the directrix is y= -4.

What is the equation of the parabola?

Guest May 3, 2017
Sort: 

1+0 Answers

 #1
avatar+75323 
+1

 

2.  (x - 11)^2  + ( y + 9)^2  =   144

 

3.  The form is  4py(y - k) = (x - h)^2  where  p  =  -1.5, k = -.5, h = 3

 

The equation is

 

4(-1.5) (y + 5.5) = (x - 3)^2

 

-6 (y + 5.5)  = (x - 3)^2

 

y + 5.5  =  (-1/6)(x - 3)^2

 

y = (-1/6) (x - 3)^2  - 5.5

 

 

 

cool cool cool

CPhill  May 3, 2017

8 Online Users

avatar
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details