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Mathematics
Mathematics
Problem
Choose the correct standard equation of the parabola whose focus is
(
a
,
0
)
(a,0)
(
a
,
0
)
and directrix
x
=
−
a
x=-a
x
=
−
a
. a)
y
2
=
−
4
a
x
y^{2}=-4ax
y
2
=
−
4
a
x
b)
x
2
=
4
a
y
x^{2}=4ay
x
2
=
4
a
y
c)
y
2
=
4
a
x
y^{2}=4ax
y
2
=
4
a
x
d)
y
2
=
2
a
x
y^{2}=2ax
y
2
=
2
a
x
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