The equation of the parabola whose vertex is at (2, -1) and focus at (2, -3) is
None of these
Vertex is (2, –1), Focus S is (2, –3)
We know the focus already. To get the equation of parabola we should try to get the equation of directrix
Let the axis meet the directrix in Z
Since A is the mid-point of SZ,
ZS is the axis and we know directrix is perpendicular to the axis
Also directrix passes through (2,1), so the equation of directrix is y = 1
Appying PS = PM
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