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Parabola with Vertical Axis

Mathematics · Class 12

For x^2=4ay, focus=(0,a) and directrix y=-a; signs determine opening.

Parabola with vertical axis
rule
worked example
Parabola with vertical axis: For x^2=4ay, focus=(0,a) and directrix y=-a; signs determine opening.
CONCEPT AND RULE: For x^2=4ay, focus=(0,a) and directrix y=-a; signs determine opening.
METHOD: For parabola with vertical axis, identify the given information and required result. Select the matc
For x^2=4ay, focus=(0,a) and directrix y=-a; signs determine opening.
Worked pattern: x^2=-12y opens downward with focus (0,-3).

Right triangle — Parabola with Vertical Axis — original sketch for this lesson (not copied from a textbook).