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An excellent derivation of the general equation from mathopenref.com
A Youtube video from Khan Academy
A Youtube video from College Algebra
This Youtube video from turksvids describes the relationship between focus, directrix, vertex, and p (a key distance) in a parabola. Writing equations of parabolas from vertex and focus, vertex and directrix, or focus and directrix.
An excellent tutorial and practice examples from algebralab.org
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