SOLUTION: -3(x+1/2)^2=y whats its focus, directrix, and vertex?

Question 981055: -3(x+1/2)^2=y
whats its focus, directrix, and vertex?
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!

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The directrix is units away from the vertex and is on the convex side of the vertex (0,-1/2). Focus is units below the vertex. The parabola is vertical and opens downward.

Focus: , or (0, -7/12).
Directrix: The line or .
Vertex: ( 0,-1/2).

Refer in your book to the derivation of a parabola equation for horizontal directrix with focus on the x-axis; and that p is the distance from either focus or directrix.

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