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13 February, 17:19

The equation of a parabola is (y-1) 2=16 (x+3). What is the equation of the directrix of the parabola? Enter your answer in the box.

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  1. 13 February, 18:57
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    (y-1) ²=16 (x+3)

    4p=16

    p=4

    Vertex is (-3,1)

    This is horizontal parabola (y²), that are turned to the right (16 is positive).

    Directrix is going to be a line x=a

    x=-3-4=-7

    x=-7
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