Answer
$(x-2)^2=-16(y-3)$
Work Step by Step
Distance of the point $(x,y)$ from the line $y=7$ is $|y-7|$
Therefore, the equation of the parabola is
$|y-7|=\sqrt {(x-2)^2+(y+1)^{2}}$
$x^2-4x+4=-16y+48$
$(x-2)^2=-16(y-3)$
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