(x-0)² = (y-2)
Put a 1 coefficient on the right:
(x-0)² = 1(y-2)
Now it is in the form
(x-h)² = 4p(y-k)
which has its vertex at the point (h,k) = (0,2),
4p = 1, so p =
it has its focus at (h,k+p) = (0,2+
) = F(0,
)
its directrix is the horizontal line whose equation is
y = k-p, or y = 2-
or y =
in green:
Edwin