Find the Vertex, Focus, and Directrix of the Parabola $y = - \frac { 1 } { 2 } ( x + 1 ) ^ { 2 }$

question 86

Essay

Find the vertex, focus, and directrix of the parabola $y = - \frac { 1 } { 2 } ( x + 1 ) ^ { 2 }$ , and sketch its graph.

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Definitions:

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