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

1 answer:

8 0

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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