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Byju's Answer
Standard XIII
Mathematics
Focal Distance
The focal dis...
Question
The focal distance of the point (9, 6) on the parabola
y
2
=
4
x
is
A
4
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B
8
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C
10
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D
16
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Solution
The correct option is
C
10
y
2
=
4
x
⇒
4
a
=
4
⇒
a
=
1
F
o
c
u
s
=
S
=
(
a
,
0
)
=
(
1
,
0
)
,
P
(
9
,
6
)
∴
F
o
c
a
l
d
i
s
t
a
n
c
e
=
S
P
=
√
(
9
−
1
)
2
+
(
6
−
0
)
2
=
√
64
+
36
=
10
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