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Parabolas and Conic Sections




 
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More Lessons for Grade 11

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Videos, worksheets, solutions, and activities to help Algebra II students learn about parabolas and conic sections.

How to sketch a parabola?
Parabolas of the form y = a(x - h)2 + k
have a vertex at (h, k)
and opens upwards if a > 0
and opens downwards if a < 0

How to find the directrix and focus of a parabola?
For x2 = 4py, y = -p is the directrix
For y2 = 4py, x = -p is the directrix

Conic Sections: Parabolas, Part 1
A quick way to roughly sketch a parabola. Nothing about directrix and focus in this video (look in part 2). Find the vertex, x and y intercepts and do a quick graph.
Conic Sections: Parabolas, Part 2 (Directrix and Focus)
How to go about finding the directrix and the focus for a parabola



Conic Sections: Parabolas, Part 3 (Focus and Directrix)
A slightly more involved example of finding the focus and directrix for a parabola.
Conic Sections: Parabolas, Part 4 (Focus and Directrix)
Find the equation for a parabola given the vertex and given the focus and/or directrix.


 
Conic Sections: Parabolas, Part 5 (Focus and Directrix)
Find the equation for a parabola given the vertex and given the focus and/or directrix.


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