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Mathematics
Problem
For the parabola
x
2
=
4
a
y
x^{2}=4ay
x
2
=
4
a
y
, the ordinate of a point is
5
a
5a
5
a
(
a
>
0
)
(a>0)
(
a
>
0
)
. Determine all possible abscissae. a)
2
5
a
2\sqrt5\,a
2
5
a
b)
20
a
20a
20
a
c)
±
2
5
a
\pm 2\sqrt5\,a
±
2
5
a
d)
5
a
\sqrt5\,a
5
a
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