Find the Vertex, Focus, Directrix, and Focal Width of the Parabola

question 148

Multiple Choice

Find the vertex, focus, directrix, and focal width of the parabola.
- $$\mathrm { x } ^ { 2 } = 36 \mathrm { y }$$

• A) Vertex: \(( 0,0 )\); Focus: \(( 9,0 )\); Directrix: \(x = 9\); Focal width: 9
• B) Vertex: \(( 0,0 )\); Focus: \(( 0,9 )\); Directrix: \(y = - 9\); Focal width: 36
• C) Vertex: \(( 0,0 )\); Focus: \(( 9,0 )\); Directrix: \(y = 9\); Focal width: 144
• D) Vertex: \(( 0,0 )\); Focus: \(( 0 , - 9 )\); Directrix: \(x = - 9\); Focal width: 144

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