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Focus and directrix introduction | Conic sections | Algebra II | Khan Academy (Khan Academy) View |
Parabola Find Vertex, Focus, Directrix, and Graph (Mario's Math Tutoring) View |
Writing the equation of a parabola given focus and directrix (Brian McLogan) View |
How to Find the Focus and Directrix of a Parabola (searching4math) View |
Conic Sections, Parabola : Find the Focus and Directrix (patrickJMT) View |
How to write the equation of a parabola given focus and directrix (Brian McLogan) View |