Finding the Focus, Directrix, and Axis of Symmetry of a Parabola Example 1

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Finding the Focus, Directrix, and Axis of Symmetry of a Parabola Example 1
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Sir, how do we know exactly whether Parabola opens left or right, then ? 0:14

sameerrai
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Why are you using C instead of P. Most major math books use P.

melissacorona