2010006307 | math4u.vsb.cz

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2010006307

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The equation of a parabola is given by

4 x^{2} + 16 x - y + 18 = 0

. Find the equation of its directrix.

x = \frac{31}{16}

x = - \frac{33}{16}

x = \frac{33}{16}

x = - \frac{31}{16}

x = \frac{15}{8}