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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
 #1
avatar+86890 
+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

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