Using a directrix of y = 2 and a focus of (3, −4), what quadratic function is created?

asked Jun 20, 2017 194k views

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Hello,
as the directrice is y=2 and the focus (3,-4), the vertex is (3,-1)

y=a(x-3)²-1
But I can't go any further... (with a<0)

Iamyojimbo answered Jun 27, 2017

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