What is the conics form of a circle?

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Now Playing:Conics circle – Example 1a

graphing a circle
Sketch each circle and state the:
i) center
ii) radius
1. ${\left( {\frac{{x - 5}}{3}} \right)^2} + {\left( {\frac{{y + 4}}{3}} \right)^2} = 1$
2. ${x^2} + {y^2} = 25$
converting a circle equation to conics form by "completing the square"
$4{x^2} + 4{y^2} + 24x - 8y + 15 = 0$
1. Convert the equation to conics form.
2. Sketch the graph and state the:
  i) center
  ii) radius
finding the equation of a circle given its properties
Find the equation of a circle with:
1. center $\left( { - 3,\;5} \right)$ , radius = 7
2. center $\left( {2,\;0} \right)$ , passing through the point $\left( { - 1,\;4} \right)$
3. diameter with endpoints $\left( { - 9,\;4} \right)$ and $\left( {15,\; - 6} \right)$
4. center $\left( { - 2,\; - 1} \right)$ , tangent to the line $3x + 4y = 15$