How do I find the vertex, focus, and directrix of a parabola?
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How do I find the vertex, focus, and directrix of a parabola?
Arrange your equation in this form:
or
The vertex is (x,k); the focus is (h, k+p); the directrix is y=k-p where p is the distance from the vertex to the focus.
You can also search;
Parabola - Wikipedia, the free encyclopedia
Basically, you put your equation into a general form.
or
vertex = (h,k)
focus = (h,k + p)
directrix y = k − p. p is the distance from the vertex to the focus
Link to: Parabola - Wikipedia, the free encyclopedia
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