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Mathematics
Problem
Prove that the locus of a point
P
(
x
,
y
)
P(x,y)
P
(
x
,
y
)
which moves such that its distance from the focus
(
a
,
0
)
(a,0)
(
a
,
0
)
equals its perpendicular distance from the line
x
=
−
a
x=-a
x
=
−
a
is
y
2
=
4
a
x
y^{2}=4ax
y
2
=
4
a
x
.
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