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2.) Explain how to find the coordinates of the focus of a parabola with vertex (0,0) and directrix y = 5.

GAMEMASTERX40 Feb 19, 2019

#1**+3 **

The parabola opens downward because the directrix is above the vertex.....to find the focus we have

( x coordinate of the vertex, y coordinate of the vertex - y value of the directrix ) =

(0, 0 - the y value of the directrix) =

(0 , 0 - 5 ) =

(0 , - 5) = the focus

CPhill Feb 19, 2019