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What is the equation of a directrix of the parabola of x^2+ 4 x + 4 y
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Conic Sections: Focus and Directrix
Engaging students: Finding the focus and directrix of a parabola – Mean
Focus -- from Wolfram MathWorld
geometry - Locating the focus, vertex, and directrix of a conic when
geometry - Locating the focus, vertex, and directrix of a conic when
Introduction to Conic Sections | Boundless Algebra