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  3. a parabola with a vertex at (0,0) has a directrix

A parabola with a vertex at (0,0) has a directrix that crosses the negative part...

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A parabola with a vertex at (0,0) has a directrix that crosses the negative part of the y-axis.Which could be the equation of the parabola?x^2 = -4yx = 4yy = 4xy=-4x

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