9000105407 | math4u.vsb.cz

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9000105407

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Parabola is a set of points that are equidistant from the point (focus) and the line (directrix). Find the equation of the directrix of the parabola

y^{2} + 6 y - 12 x + 21 = 0

.

x + 2 = 0

x - 5 = 0

y + 3 = 0

y - 1 = 0