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16 October, 20:14

What is the equation of the directrix of the parabola given by the equation (y - 3) 2 = 8 (x - 5) ?

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  1. 16 October, 20:17
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    The vertex of the parabola is at (5,3) and its focal length is 8/4 = 2.

    Since it opens to the right, the directrix will be a vertical line 2 units to the left of the vertex, so its equation will be x = (5-2), or x=3
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