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Problem
Problem
The condition that the parabolas
y
2
=
4
c
(
x
−
d
)
y^2 = 4c(x - d)
y
2
=
4
c
(
x
−
d
)
and
y
2
=
4
a
x
y^2 = 4ax
y
2
=
4
a
x
have a common normal other than X-axis (
a
>
0
,
c
>
0
a > 0, c > 0
a
>
0
,
c
>
0
) is a.
2
a
<
2
c
+
d
2a < 2c + d
2
a
<
2
c
+
d
b.
2
c
<
2
a
+
d
2c < 2a + d
2
c
<
2
a
+
d
c.
2
d
<
2
a
+
c
2d < 2a + c
2
d
<
2
a
+
c
d.
2
d
<
2
c
+
a
2d < 2c + a
2
d
<
2
c
+
a
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