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Mathematics
Problem
For the parabola having focus
(
a
,
0
)
(a,0)
(
a
,
0
)
and directrix
x
=
−
a
x=-a
x
=
−
a
, a point
P
(
x
,
y
)
P(x,y)
P
(
x
,
y
)
belongs to the curve only if a)
(
x
−
a
)
2
+
y
2
=
(
y
+
a
)
2
(x-a)^{2}+y^{2}=(y+a)^{2}
(
x
−
a
)
2
+
y
2
=
(
y
+
a
)
2
b)
y
2
=
4
a
(
x
−
a
)
y^{2}=4a(x-a)
y
2
=
4
a
(
x
−
a
)
c)
(
x
−
a
)
2
+
y
2
=
(
x
+
a
)
2
(x-a)^{2}+y^{2}=(x+a)^{2}
(
x
−
a
)
2
+
y
2
=
(
x
+
a
)
2
d)
(
x
+
a
)
2
+
y
2
=
(
x
−
a
)
2
(x+a)^{2}+y^{2}=(x-a)^{2}
(
x
+
a
)
2
+
y
2
=
(
x
−
a
)
2
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