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?
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
