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Byju's Answer
Standard XII
Mathematics
Geometric Mean
On the parabo...
Question
On the parabola
y
2
=
8
x
if one extremity of a focal chord is
(
1
2
,
−
2
)
then its other extremity is
A
(
2
,
2
)
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B
(
1
8
,
−
8
)
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C
(
8
,
1
8
)
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D
(
8
,
8
)
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Solution
The correct option is
B
(
8
,
8
)
For
(
1
2
,
−
2
)
,
t
=
−
1
2
Let the other extremity be
t
2
Then
t
t
2
=
−
1
.....(property of focal chord)
⇒
t
2
=
2
Therefore,
(
a
t
2
2
,
2
a
t
2
)
=
(
8
,
8
)
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