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Mathematics
Problem
The equation of a parabola is
y
2
=
−
9
x
y^2 = -9x
y
2
=
−
9
x
. Where is its focus located? a)
(
−
9
2
,
0
)
\left(-\dfrac{9}{2},\,0\right)
(
−
2
9
,
0
)
b)
(
9
4
,
0
)
\left(\dfrac{9}{4},\,0\right)
(
4
9
,
0
)
c)
(
−
9
4
,
0
)
\left(-\dfrac{9}{4},\,0\right)
(
−
4
9
,
0
)
d)
(
0
,
9
4
)
\left(0,\,\dfrac{9}{4}\right)
(
0
,
4
9
)
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