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

question 102

Multiple Choice

Find the vertex, focus, directrix, and focal width of the parabola.
- $$- \frac { 1 } { 40 } x ^ { 2 } = y$$

• A) Vertex: \(( 0,0 )\); Focus: \(( 0 , - 10 )\); Directrix: \(y = 10\); Focal width: 40
• B) Vertex: \(( 0,0 )\); Focus: \(( 0,10 )\); Directrix: y \(= - 10\); Focal width: 10
• C) Vertex: \(( 0,0 )\); Focus: \(( - 20,0 )\); Directrix: \(x = 10\); Focal width: 160
• D) Vertex: \(( 0,0 )\); Focus: \(( 0 , - 10 )\); Directrix: \(y = 10\); Focal width: 160

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